diff --git a/invokeai/app/services/session_processor/session_processor_default.py b/invokeai/app/services/session_processor/session_processor_default.py
index 430f72bbac..f7affc7596 100644
--- a/invokeai/app/services/session_processor/session_processor_default.py
+++ b/invokeai/app/services/session_processor/session_processor_default.py
@@ -128,6 +128,7 @@ class DefaultSessionProcessor(SessionProcessorBase):
 
                         if self._queue_item is None:
                             # Empty queue, wait for next polling interval or event to try again
+                            poll_now_event.wait(self._polling_interval)
                             continue
 
                         self._invoker.services.logger.debug(f"Executing queue item {self._queue_item.item_id}")