diff --git a/src/drawscreen.c b/src/drawscreen.c
index 453ca91..e0fb122 100644
--- a/src/drawscreen.c
+++ b/src/drawscreen.c
@@ -2539,6 +2539,11 @@
 	    eof = TRUE;
 	    break;
 	}
+
+	// Safety check: if any of the wl_size values is wrong we might go over
+	// the end of w_lines[].
+	if (idx >= Rows)
+	    break;
     }
 
     // End of loop over all window lines.