fix some crashes and bugs (#381)

- fix crash in bhv_lll_bowser_puzzle_piece_update (thanks to djoslin)
- fix crash in platform_on_track_act_init
- fix chat commands not working on dev builds
- log when the crash handler is called
- if a custom level tries to set an invalid background, change it to BACKGROUND_OCEAN_SKY

src/dev/chat.c

@@ -112,6 +112,8 @@ bool exec_dev_chat_command(char* command) {
         smlua_exec_file(&command[6]);
         return true;
     }
+
+    return false;
 }
 
 void dev_display_chat_commands(void) {

src/engine/graph_node.c

@@ -8,6 +8,8 @@
 #include "game/rendering_graph_node.h"
 #include "game/area.h"
 #include "geo_layout.h"
+#include "include/geo_commands.h"
+#include "pc/debuglog.h"
 
 // unused Mtx(s)
 s16 identityMtx[4][4] = { { 1, 0, 0, 0 }, { 0, 1, 0, 0 }, { 0, 0, 1, 0 }, { 0, 0, 0, 1 } };
@@ -486,6 +488,11 @@ struct GraphNodeBackground *init_graph_node_background(struct AllocOnlyPool *poo
     if (graphNode != NULL) {
         init_scene_graph_node_links(&graphNode->fnNode.node, GRAPH_NODE_TYPE_BACKGROUND);
 
+        if (background > BACKGROUND_CUSTOM) {
+            LOG_ERROR("invalid background id");
+            background = BACKGROUND_OCEAN_SKY;
+        }
+
         graphNode->background = (background << 16) | background;
         graphNode->fnNode.func = backgroundFunc;
         graphNode->unused = zero; // always 0, unused

src/game/behaviors/platform_on_track.inc.c

@@ -315,6 +315,8 @@ static void platform_on_track_rock_ski_lift(void) {
  * Update function for bhvPlatformOnTrack.
  */
 void bhv_platform_on_track_update(void) {
+    if (!o->oPlatformOnTrackStartWaypoint) { return; }
+
     switch (o->oAction) {
         case PLATFORM_ON_TRACK_ACT_INIT:
             platform_on_track_act_init();

src/pc/crash_handler.c

@@ -24,6 +24,7 @@
 #include "pc/network/network.h"
 #include "pc/gfx/gfx_rendering_api.h"
 #include "pc/mods/mods.h"
+#include "pc/debuglog.h"
 
 typedef struct {
     s32 x, y;
@@ -298,6 +299,7 @@ static CRASH_HANDLER_TYPE crash_handler(EXCEPTION_POINTERS *ExceptionInfo) {
 #elif __linux__
 static void crash_handler(const int signalNum, siginfo_t *info, ucontext_t *context) {
 #endif
+    LOG_INFO("game crashed! preparing crash screen...");
     memset(sCrashHandlerText, 0, sizeof(sCrashHandlerText));
     CrashHandlerText *pText = &sCrashHandlerText[0];
     gDjuiDisabled = true;