diff --git a/src/core.py b/src/core.py
index 13334ef85..8a211d550 100644
--- a/src/core.py
+++ b/src/core.py
@@ -723,7 +723,7 @@ class Manager:
 		try:
 			ret = float(up/down)
 		except:
-			ret = -1
+			ret = 0
 
 		return ret