Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTypeEncodingParser.cpp
@@ -230,15 +230,13 @@
 
     auto types = decl_vendor->FindTypes(ConstString(name), /*max_matches*/ 1);
 
-// The user can forward-declare something that has no definition.  The runtime
-// doesn't prohibit this at all. This is a rare and very weird case.  We keep
-// this assert in debug builds so we catch other weird cases.
-#ifdef LLDB_CONFIGURATION_DEBUG
-    assert(!types.empty());
-#else
-    if (types.empty())
+    // The user can forward-declare something that has no definition.  The runtime
+    // doesn't prohibit this at all. This is a rare and very weird case.
+    if (types.empty()) {
+      Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_TYPES);
+      LLDB_LOG(log, "Could not find type with name '{0}' in runtime", name);
       return ast_ctx.getObjCIdType();
-#endif
+    }
 
     return ClangUtil::GetQualType(types.front().GetPointerType());
   } else {