1 files changed, 1 insertions, 0 deletions

diff --git a/src/ui/inputwidget.c b/src/ui/inputwidget.c
index 6246078e..7786cf22 100644
--- a/src/ui/inputwidget.c
+++ b/src/ui/inputwidget.c
@@ -776,6 +776,7 @@ static iRangei visibleLineRange_InputWidget_(const iInputWidget *d) {
         }
         else break;
     }
+    iAssert(isEmpty_Range(&vis) || (vis.start >= 0 && vis.end >= vis.start));
     return vis;
 }