App: Mitigations against a possible crash

A tab switch may have ended up accessing a NULL pointer.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/app.c b/src/app.c
index d8053315..3107cda3 100644
--- a/src/app.c
+++ b/src/app.c
@@ -397,7 +397,7 @@ static iBool loadState_App_(iApp *d) {
             readData_File(f, 4, magic);
             if (!memcmp(magic, magicTabDocument_App_, 4)) {
                 if (!doc) {
-                    doc = newTab_App(NULL, iTrue);
+                    doc = newTab_App(NULL, iFalse /* no switching */);
                 }
                 if (read8_File(f)) {
                     current = doc;
diff --git a/src/ui/util.c b/src/ui/util.c
index 754545bd..6fa3e293 100644
--- a/src/ui/util.c
+++ b/src/ui/util.c
@@ -768,7 +768,7 @@ iLabelWidget *makeMenuButton_LabelWidget(const char *label, const iMenuItem *ite
 /*-----------------------------------------------------------------------------------------------*/
 
 static iBool isTabPage_Widget_(const iWidget *tabs, const iWidget *page) {
-    return page->parent == findChild_Widget(tabs, "tabs.pages");
+    return page && page->parent == findChild_Widget(tabs, "tabs.pages");
 }
 
 static iBool tabSwitcher_(iWidget *tabs, const char *cmd) {
@@ -787,7 +787,7 @@ static iBool tabSwitcher_(iWidget *tabs, const char *cmd) {
         }
         else if (hasParent_Widget(target, tabs)) {
             /* Some widget on a page. */
-            while (!isTabPage_Widget_(tabs, target)) {
+            while (target && !isTabPage_Widget_(tabs, target)) {
                 target = target->parent;
             }
             showTabPage_Widget(tabs, target);