diff --git a/logger.py b/logger.py
index f30a4f7..9b51a9e 100755
--- a/logger.py
+++ b/logger.py
@@ -342,9 +342,12 @@ if "opensensemap" in log_conf:
     push_counter=0
     sensebox_id=conf_osm['sensebox_id'] # id of opensensemap
     push_vars=conf_osm['sensors'].keys()
-    for (i in push_vars):
-      if (i not in channel_names):
-        push_vars.remove(i)
+    for pv in conf_osm['sensors'].keys():
+      if (pv not in channel_names):
+        if len(push_vars)>1:
+          push_vars.remove(pv)
+        else:
+          push_vars=[]
     if (len(push_vars) == 0):
       bosm=False
     else: