gui: Make FrameDataProvider destructor virtual.

diff --git a/gui/graphing/frameaxiswidget.h b/gui/graphing/frameaxiswidget.h
index db091d919b3056bff2bea92a9e78981ef189015d..59fdc162d63237c8792c2c38ef615540c5da0285 100644 (file)
--- a/gui/graphing/frameaxiswidget.h
+++ b/gui/graphing/frameaxiswidget.h
@@ -5,6 +5,8 @@
 
 class FrameDataProvider {
 public:
+    virtual ~FrameDataProvider() {}
+
     /* Number of frames */
     virtual unsigned size() const = 0;