diff --git a/share/functions/math.fish b/share/functions/math.fish
index b262fd3bd..ced85aad4 100644
--- a/share/functions/math.fish
+++ b/share/functions/math.fish
@@ -8,6 +8,7 @@ function math --description "Perform math calculations in bc"
 		end
 
 		set -l out (echo $argv|env BC_LINE_LENGTH=0 bc)
+                test -z "$out"; and return 1
 		echo $out
 		switch $out
 			case 0