diff --git a/modules/actions/add_member.js b/modules/actions/add_member.js
index acf14f599..941f795ea 100644
--- a/modules/actions/add_member.js
+++ b/modules/actions/add_member.js
@@ -1,6 +1,6 @@
 import _groupBy from 'lodash-es/groupBy';
-import _omit from 'lodash-es/omit';
 
+import { utilObjectOmit } from '../util';
 import { osmJoinWays, osmWay } from '../osm';
 
 
@@ -135,7 +135,7 @@ export function actionAddMember(relationId, member, memberIndex, insertPair) {
                 wayMembers.push(item.pair[0]);
                 wayMembers.push(item.pair[1]);
             } else {
-                wayMembers.push(_omit(item, 'index'));
+                wayMembers.push(utilObjectOmit(item, ['index']));
             }
         }
 
@@ -144,7 +144,7 @@ export function actionAddMember(relationId, member, memberIndex, insertPair) {
         // see https://wiki.openstreetmap.org/wiki/Public_transport#Service_routes
         var newMembers = PTv2members.concat( (groups.node || []), wayMembers, (groups.relation || []) );
 
-        return graph.replace(relation.update({members: newMembers}));
+        return graph.replace(relation.update({ members: newMembers }));
 
 
         // `moveMember()` changes the `members` array in place by splicing
diff --git a/modules/actions/merge_polygon.js b/modules/actions/merge_polygon.js
index 51186a5d2..0b2bc23f6 100644
--- a/modules/actions/merge_polygon.js
+++ b/modules/actions/merge_polygon.js
@@ -1,9 +1,8 @@
 import _groupBy from 'lodash-es/groupBy';
-import _map from 'lodash-es/map';
-import _omit from 'lodash-es/omit';
 
 import { geoPolygonContainsPolygon } from '../geo';
 import { osmJoinWays, osmRelation } from '../osm';
+import { utilObjectOmit } from '../util';
 
 
 export function actionMergePolygon(ids, newRelationId) {
@@ -48,8 +47,8 @@ export function actionMergePolygon(ids, newRelationId) {
             return polygons.map(function(d, n) {
                 if (i === n) return null;
                 return geoPolygonContainsPolygon(
-                    _map(d.nodes, 'loc'),
-                    _map(w.nodes, 'loc')
+                    d.nodes.map(function(n) { return n.loc; }),
+                    w.nodes.map(function(n) { return n.loc; })
                 );
             });
         });
@@ -108,7 +107,7 @@ export function actionMergePolygon(ids, newRelationId) {
 
         return graph.replace(relation.update({
             members: members,
-            tags: _omit(relation.tags, 'area')
+            tags: utilObjectOmit(relation.tags, ['area'])
         }));
     };
 
diff --git a/modules/behavior/hash.js b/modules/behavior/hash.js
index 8a059a746..b6713328b 100644
--- a/modules/behavior/hash.js
+++ b/modules/behavior/hash.js
@@ -1,11 +1,10 @@
-import _omit from 'lodash-es/omit';
 import _throttle from 'lodash-es/throttle';
 
 import { select as d3_select } from 'd3-selection';
 
 import { geoSphericalDistance } from '../geo';
 import { modeBrowse } from '../modes';
-import { utilQsString, utilStringQs } from '../util';
+import { utilObjectOmit, utilQsString, utilStringQs } from '../util';
 
 
 export function behaviorHash(context) {
@@ -21,9 +20,9 @@ export function behaviorHash(context) {
             return true; // replace bogus hash
 
         } else if (s !== formatter(map).slice(1)) {   // hash has changed
-            var mode = context.mode(),
-                dist = geoSphericalDistance(map.center(), [args[2], args[1]]),
-                maxdist = 500;
+            var mode = context.mode();
+            var dist = geoSphericalDistance(map.center(), [args[2], args[1]]);
+            var maxdist = 500;
 
             // Don't allow the hash location to change too much while drawing
             // This can happen if the user accidently hit the back button.  #3996
@@ -40,7 +39,7 @@ export function behaviorHash(context) {
         var center = map.center();
         var zoom = map.zoom();
         var precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
-        var q = _omit(utilStringQs(window.location.hash.substring(1)),
+        var q = utilObjectOmit(utilStringQs(window.location.hash.substring(1)),
             ['comment', 'source', 'hashtags', 'walkthrough']
         );
         var newParams = {};
diff --git a/modules/core/history.js b/modules/core/history.js
index 0f330b2a7..84735e774 100644
--- a/modules/core/history.js
+++ b/modules/core/history.js
@@ -7,7 +7,6 @@ import _isFunction from 'lodash-es/isFunction';
 import _isEmpty from 'lodash-es/isEmpty';
 import _forEach from 'lodash-es/forEach';
 import _map from 'lodash-es/map';
-import _omit from 'lodash-es/omit';
 import _uniq from 'lodash-es/uniq';
 
 import { dispatch as d3_dispatch } from 'd3-dispatch';
@@ -19,7 +18,7 @@ import { coreGraph } from './graph';
 import { coreTree } from './tree';
 import { osmEntity } from '../osm/entity';
 import { uiLoading } from '../ui';
-import { utilRebind, utilSessionMutex } from '../util';
+import { utilObjectOmit, utilRebind, utilSessionMutex } from '../util';
 
 
 export function coreHistory(context) {
@@ -393,7 +392,7 @@ export function coreHistory(context) {
 
 
             function customizer(src) {
-                var copy = _omit(_cloneDeep(src), ['type', 'user', 'v', 'version', 'visible']);
+                var copy = utilObjectOmit(_cloneDeep(src), ['type', 'user', 'v', 'version', 'visible']);
                 if (_isEmpty(copy.tags)) {
                     delete copy.tags;
                 }
diff --git a/modules/presets/preset.js b/modules/presets/preset.js
index 44ed18cd5..c6ba50744 100644
--- a/modules/presets/preset.js
+++ b/modules/presets/preset.js
@@ -1,8 +1,8 @@
-import _omit from 'lodash-es/omit';
 import _uniq from 'lodash-es/uniq';
 
 import { t } from '../util/locale';
 import { areaKeys } from '../core/context';
+import { utilObjectOmit } from '../util';
 
 
 export function presetPreset(id, preset, fields, visible, rawPresets) {
@@ -183,7 +183,7 @@ export function presetPreset(id, preset, fields, visible, rawPresets) {
         }
 
         // Lookup documentation on OSM Wikibase...
-        var key = reference.key || Object.keys(_omit(preset.tags, 'name'))[0];
+        var key = reference.key || Object.keys(utilObjectOmit(preset.tags, 'name'))[0];
         var value = reference.value || preset.tags[key];
 
         if (geometry === 'relation' && key === 'type') {
@@ -205,7 +205,7 @@ export function presetPreset(id, preset, fields, visible, rawPresets) {
 
     preset.removeTags = preset.removeTags || preset.tags || {};
     preset.unsetTags = function(tags, geometry) {
-        tags = _omit(tags, Object.keys(preset.removeTags));
+        tags = utilObjectOmit(tags, Object.keys(preset.removeTags));
 
         for (var f in preset.fields) {
             var field = preset.fields[f];
diff --git a/modules/services/taginfo.js b/modules/services/taginfo.js
index 00cc6efee..ee26c0c23 100644
--- a/modules/services/taginfo.js
+++ b/modules/services/taginfo.js
@@ -1,10 +1,9 @@
 import _debounce from 'lodash-es/debounce';
 import _forEach from 'lodash-es/forEach';
-import _omit from 'lodash-es/omit';
 
 import { json as d3_json } from 'd3-request';
 
-import { utilQsString } from '../util';
+import { utilObjectOmit, utilQsString } from '../util';
 import { currentLocale } from '../util/locale';
 
 
@@ -65,7 +64,7 @@ function setSortMembers(params) {
 
 
 function clean(params) {
-    return _omit(params, ['geometry', 'debounce']);
+    return utilObjectOmit(params, ['geometry', 'debounce']);
 }
 
 
diff --git a/modules/util/index.js b/modules/util/index.js
index 181dc65ef..80bd8a252 100644
--- a/modules/util/index.js
+++ b/modules/util/index.js
@@ -19,6 +19,7 @@ export { utilHighlightEntities } from './util';
 export { utilIdleWorker } from './idle_worker';
 export { utilKeybinding } from './keybinding';
 export { utilNoAuto } from './util';
+export { utilObjectOmit } from './object';
 export { utilPrefixCSSProperty } from './util';
 export { utilPrefixDOMProperty } from './util';
 export { utilPreset } from './util';
diff --git a/modules/util/object.js b/modules/util/object.js
new file mode 100644
index 000000000..fc905e81d
--- /dev/null
+++ b/modules/util/object.js
@@ -0,0 +1,9 @@
+
+export function utilObjectOmit(obj, omitKeys) {
+    return Object.keys(obj).reduce(function(result, key) {
+        if (omitKeys.indexOf(key) === -1) {
+            result[key] = obj[key];  // keep
+        }
+        return result;
+    }, {});
+}
diff --git a/modules/util/util.js b/modules/util/util.js
index b02b2ee08..6ab48cbbf 100644
--- a/modules/util/util.js
+++ b/modules/util/util.js
@@ -1,5 +1,3 @@
-import _map from 'lodash-es/map';
-
 import { t, textDirection } from './locale';
 import { utilDetect } from './detect';
 import { remove as removeDiacritics } from 'diacritics';
@@ -7,7 +5,9 @@ import { fixRTLTextForSvg, rtlRegex } from './svg_paths_rtl_fix';
 
 
 export function utilTagText(entity) {
-    return _map(entity.tags, function(v, k) {
+    var obj = (entity && entity.tags) || {};
+    return Object.keys(obj).map(function(k) {
+        var v = obj[k];
         return k + '=' + v;
     }).join(', ');
 }
diff --git a/test/spec/util/object.js b/test/spec/util/object.js
new file mode 100644
index 000000000..2d577a8a6
--- /dev/null
+++ b/test/spec/util/object.js
@@ -0,0 +1,9 @@
+describe('iD.utilObjectOmit', function() {
+    it('omits keys', function() {
+        var t = { a: 1, b: 2 };
+        expect(iD.utilObjectOmit(t, [])).to.eql({ a: 1, b: 2 });
+        expect(iD.utilObjectOmit(t, ['a'])).to.eql({ b: 2 });
+        expect(iD.utilObjectOmit(t, ['a', 'b'])).to.eql({});
+    });
+});
+