Fix a crash that may happen during initial loading in certain circumstances

libnymea-app/things.h

@@ -31,11 +31,14 @@
 #ifndef THINGS_H
 #define THINGS_H
 
-#include <QAbstractListModel>
-
 #include "types/thing.h"
 #include "types/thingclass.h"
 
+#include <QAbstractListModel>
+#include <QLoggingCategory>
+
+Q_DECLARE_LOGGING_CATEGORY(dcThingManager)
+
 class Things : public QAbstractListModel
 {
     Q_OBJECT

libnymea-app/thingsproxy.cpp

@@ -583,6 +583,10 @@ bool ThingsProxy::lessThan(const QModelIndex &left, const QModelIndex &right) co
 bool ThingsProxy::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
 {
     Thing *thing = getInternal(source_row);
+    if (!thing) {
+        qCWarning(dcThingManager()) << "filterAcceptsRow called for a source row we can't find in the source model!";
+        return false;
+    }
     if (!m_filterTagId.isEmpty()) {
         Tag *tag = m_engine->tagsManager()->tags()->findThingTag(thing->id().toString(), m_filterTagId);
         if (!tag) {