Fix crash when no grid lines present

nyalldawson · nyalldawson · commit 3d61e5311af2 · 2025-12-05T09:42:36.000+10:00
diff --git a/src/core/layout/qgslayoutitemmapgrid.cpp b/src/core/layout/qgslayoutitemmapgrid.cpp
@@ -1266,6 +1266,9 @@ void QgsLayoutItemMapGrid::drawGridFrameLine( QPainter *p, GridExtension *extens
 void QgsLayoutItemMapGrid::drawCoordinateAnnotations( QgsRenderContext &context, QgsExpressionContext &expressionContext,
     GridExtension *extension ) const
 {
+  if ( mGridLines.empty() )
+    return;
+
   QString currentAnnotationString;
   QList< GridLine >::const_iterator it = mGridLines.constBegin();
 

Original file line number	Diff line number	Diff line change
`@@ -1266,6 +1266,9 @@ void QgsLayoutItemMapGrid::drawGridFrameLine( QPainter p, GridExtension extens`
`1266`	`1266`	`void QgsLayoutItemMapGrid::drawCoordinateAnnotations( QgsRenderContext &context, QgsExpressionContext &expressionContext,`
`1267`	`1267`	`GridExtension *extension ) const`
`1268`	`1268`	`{`
	`1269`	`+ if ( mGridLines.empty() )`
	`1270`	`+ return;`
	`1271`	`+`
`1269`	`1272`	`QString currentAnnotationString;`
`1270`	`1273`	`QList< GridLine >::const_iterator it = mGridLines.constBegin();`
`1271`	`1274`