fix log_exc throwing exception
diff --git a/xos/synchronizers/base/event_loop.py b/xos/synchronizers/base/event_loop.py
index 6cfc9f6..c1b9cda 100644
--- a/xos/synchronizers/base/event_loop.py
+++ b/xos/synchronizers/base/event_loop.py
@@ -421,7 +421,7 @@
 				except Exception,e:
                         		self.consolePrint(bcolors.FAIL + "Model step %r failed" % (sync_step.__name__) + bcolors.ENDC)
 					logger.error('Model step %r failed. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!' % (sync_step.__name__, e))
-					logger.log_exc(e)
+					logger.log_exc("Exception in sync step")
 					self.failed_steps.append(S)
 					my_status = STEP_STATUS_KO
 			else:
diff --git a/xos/synchronizers/openstack/event_loop.py b/xos/synchronizers/openstack/event_loop.py
index 3a14511..db78f07 100644
--- a/xos/synchronizers/openstack/event_loop.py
+++ b/xos/synchronizers/openstack/event_loop.py
@@ -421,7 +421,7 @@
 				except Exception,e:
                         		self.consolePrint(bcolors.FAIL + "Model step %r failed" % (sync_step.__name__) + bcolors.ENDC)
 					logger.error('Model step %r failed. This seems like a misconfiguration or bug: %r. This error will not be relayed to the user!' % (sync_step.__name__, e))
-					logger.log_exc(e)
+					logger.log_exc("Exception in sync step")
 					self.failed_steps.append(S)
 					my_status = STEP_STATUS_KO
 			else: