diff --git a/backend/resources/log4j2-devenv.xml b/backend/resources/log4j2-devenv.xml
index a37eb18010..7abb7a1885 100644
--- a/backend/resources/log4j2-devenv.xml
+++ b/backend/resources/log4j2-devenv.xml
@@ -26,6 +26,7 @@
     <Logger name="app.worker" level="trace" />
     <Logger name="app.msgbus" level="info" />
     <Logger name="app.http.websocket" level="info" />
+    <Logger name="app.http.sse" level="info" />
     <Logger name="app.util.websocket" level="info" />
     <Logger name="app.redis" level="info" />
     <Logger name="app.rpc.rlimit" level="info" />
diff --git a/backend/src/app/http/sse.clj b/backend/src/app/http/sse.clj
index c89c91b618..0ece3b3295 100644
--- a/backend/src/app/http/sse.clj
+++ b/backend/src/app/http/sse.clj
@@ -80,6 +80,9 @@
                          (try
                            (tap "end" (handler))
                            (catch Throwable cause
+                             (binding [l/*context* (errors/request->context request)]
+                               (l/err :hint "unexpected error process streaming response"
+                                      :cause cause))
                              (tap "error" (errors/handle' cause request)))
                            (finally
                              (sp/close! *channel*)
diff --git a/common/src/app/common/files/validate.cljc b/common/src/app/common/files/validate.cljc
index f6d12ada09..280271701d 100644
--- a/common/src/app/common/files/validate.cljc
+++ b/common/src/app/common/files/validate.cljc
@@ -48,7 +48,8 @@
     :not-head-main-not-allowed
     :not-head-copy-not-allowed
     :not-component-not-allowed
-    :component-nil-objects-not-allowed})
+    :component-nil-objects-not-allowed
+    :instance-head-not-frame})
 
 (def ^:private
   schema:error
diff --git a/frontend/src/app/worker/import.cljs b/frontend/src/app/worker/import.cljs
index 96bd5d7b93..fe923aec77 100644
--- a/frontend/src/app/worker/import.cljs
+++ b/frontend/src/app/worker/import.cljs
@@ -728,7 +728,7 @@
                                          ::log/sync? true)
                               (let [edata (if (map? cause) cause (ex-data cause))]
                                 (println "Error data:")
-                                (pp/pprint (dissoc edata :explain) {:level 2 :length 10})
+                                (pp/pprint (dissoc edata :explain) {:level 3 :length 10})
 
                                 (when (string? (:explain edata))
                                   (js/console.log (:explain edata)))