diff --git a/code/Common/Assimp.cpp b/code/Common/Assimp.cpp
index 073ce2ad7..ee7f3fed8 100644
--- a/code/Common/Assimp.cpp
+++ b/code/Common/Assimp.cpp
@@ -354,9 +354,10 @@ ASSIMP_API const aiScene *aiApplyCustomizedPostProcessing(const aiScene *scene,
 void CallbackToLogRedirector(const char *msg, char *dt) {
     ai_assert(nullptr != msg);
     ai_assert(nullptr != dt);
-    LogStream *s = (LogStream *)dt;
-
-    s->write(msg);
+    LogStream *stream = (LogStream *)dt;
+    if (stream != nullptr) {
+        stream->write(msg);
+    }
 }
 
 static LogStream *DefaultStream = nullptr;
diff --git a/code/PostProcessing/SortByPTypeProcess.cpp b/code/PostProcessing/SortByPTypeProcess.cpp
index d16f0e59f..162ddab6f 100644
--- a/code/PostProcessing/SortByPTypeProcess.cpp
+++ b/code/PostProcessing/SortByPTypeProcess.cpp
@@ -136,6 +136,9 @@ void SortByPTypeProcess::Execute(aiScene *pScene) {
     for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {
         aiMesh *const mesh = pScene->mMeshes[i];
         if (mesh->mPrimitiveTypes == 0) {
+            for (size_t idx = 0; idx < outMeshes.size(); ++idx) {
+                delete outMeshes[idx];
+            }
             throw DeadlyImportError("Mesh with invalid primitive type: ", mesh->mName.C_Str());
         }
 
diff --git a/test/models/fuzzer_data/clusterfuzz-testcase-minimized-assimp_fuzzer-4751812606885888 b/test/models/fuzzer_data/clusterfuzz-testcase-minimized-assimp_fuzzer-4751812606885888
new file mode 100644
index 000000000..36861a7e3
Binary files /dev/null and b/test/models/fuzzer_data/clusterfuzz-testcase-minimized-assimp_fuzzer-4751812606885888 differ
diff --git a/test/unit/utSortByPType.cpp b/test/unit/utSortByPType.cpp
index 5ebdc6f9e..2c1ceca33 100644
--- a/test/unit/utSortByPType.cpp
+++ b/test/unit/utSortByPType.cpp
@@ -43,6 +43,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "Common/ScenePreprocessor.h"
 #include "PostProcessing/SortByPTypeProcess.h"
 #include <assimp/scene.h>
+#include <assimp/postprocess.h>
 
 using namespace std;
 using namespace Assimp;
@@ -202,3 +203,9 @@ TEST_F(SortByPTypeProcessTest, SortByPTypeStep) {
         }
     }
 }
+
+TEST_F(SortByPTypeProcessTest, issue389327770Test) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/fuzzer_data/clusterfuzz-testcase-minimized-assimp_fuzzer-4751812606885888", aiProcessPreset_TargetRealtime_Fast);
+    EXPECT_NE(nullptr, scene);
+}