diff --git a/webif/html/browse/crop/crop.jim b/webif/html/browse/crop/crop.jim
index 1c3fe09..f717956 100755
--- a/webif/html/browse/crop/crop.jim
+++ b/webif/html/browse/crop/crop.jim
@@ -37,6 +37,10 @@ puts "<div style=\"position: relative; top: -10px\">"
 
 proc div {type left right} {
 	set width $($right - $left)
+	if {$width < 0} {
+		# negative values are invalid for CSS width
+		set width 0
+	}
 	puts "<div class=$type style=\"left: ${left}px; width: ${width}px\">
 	    $type</div>"
 }