[Bug] Frequent reboot game can sometimes cause the core to crash (fault addr 0x0).

[TTTUUUIII]

The crash occurs in the FlushSecondaryBuffer function within the src/NDSCart_SRAMManager.cpp file when the SecondaryBuffer pointer is nullptr.

diff --git a/src/NDSCart_SRAMManager.cpp b/src/NDSCart_SRAMManager.cpp
index ba31e8c..ebeaec4 100644
--- a/src/NDSCart_SRAMManager.cpp
+++ b/src/NDSCart_SRAMManager.cpp
@@ -69,6 +69,9 @@ void DeInit()
 
     if (SecondaryBuffer) delete SecondaryBuffer;
     SecondaryBuffer = NULL;
+    FlushVersion = 0;
+    PreviousFlushVersion = 0;
+    TimeAtLastFlushRequest = 0;
 
     Platform::Mutex_Free(SecondaryBufferLock);
 }