diff --git a/src/core/slavebase.cpp b/src/core/slavebase.cpp
--- a/src/core/slavebase.cpp
+++ b/src/core/slavebase.cpp
@@ -1097,7 +1097,8 @@
         if (isSubCommand(cmd)) {
             dispatch(cmd, data);
         } else {
-            qFatal("Fatal Error: Got cmd %d, while waiting for an answer!", cmd);
+            qDebug("Error: Got cmd %d, while waiting for an answer!", cmd);
+            return -1;
         }
     }
 }