1 files changed, 4 insertions, 0 deletions
diff --git a/aergia b/aergia
index 598509c..2918ef6 100755
--- a/aergia
+++ b/aergia
@@ -240,6 +240,10 @@ class Aergia(object):
         '''Given an asyncio event loop, returns the list of idle task frames.
         A task is considered 'idle' if it is not currently executing.'''
         idle = []
+        if not loop.get_debug():
+            # ensure the loop is in debug mode. Otherwise,
+            # _source_traceback is NULL.
+            loop.set_debug(True)
         for th in loop._scheduled:
             st = th._source_traceback
             if st: