diff --git a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileEditorManagerImpl.java b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileEditorManagerImpl.java
index 354e0c774a51..5c34d2eb2523 100644
--- a/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileEditorManagerImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileEditorManagerImpl.java
@@ -792,7 +792,7 @@ public class FileEditorManagerImpl extends FileEditorManagerEx implements Projec
       for (int i = 0; i < providers.length; i++) {
         try {
           final FileEditorProvider provider = providers[i];
-          LOG.assertTrue(provider != null);
+          LOG.assertTrue(provider != null, "Provider for file "+file+" is null. All providers: "+Arrays.asList(providers));
           LOG.assertTrue(provider.accept(myProject, file), "Provider " + provider + " doesn't accept file " + file);
           final FileEditor editor = provider.createEditor(myProject, file);
           LOG.assertTrue(editor != null);