Merge pull request #1292 from prot0man/heapq_bugfix

Add explicit check for if timeout_heap has been set to None before do…

pika/adapters/select_connection.py

@@ -247,6 +247,9 @@ def call_later(self, delay, callback):
         :raises ValueError, TypeError
 
         """
+        if self._timeout_heap is None:
+            raise ValueError("Timeout closed before call")
+
         if delay < 0:
             raise ValueError(
                 'call_later: delay must be non-negative, but got %r' % (delay,))