Crash when closing game: Object from PIE level still referenced. Shortest path from root: (Object is not currently rooted)

Development Pipeline & Plugins Editor Scripting
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It seems the following code causes the crash (located in PostInitializeComponents):

//Get and assign Material Instance
	if (Pickup_Material != NULL)
	{
		//Pickup_Material is a UMaterialInstanceDynamic, inherited from the parent class
		Pickup_Material->SetVectorParameterValue(FName(TEXT("Tint")), ColorTint);

		TArray<FSkeletalMaterial> CharMats;

		if (SkelMesh_Gear_Male != NULL)
		{
			CharMats = SkelMesh_Gear_Male->Materials;

			for (int32 iMats = 0; iMats < CharMats.Num(); iMats++)
			{
				if (SkelMesh_Gear_Male->Materials[iMats].MaterialInterface == Pickup_Material_Origin)
				{
					SkelMesh_Gear_Male->Materials[iMats].MaterialInterface = Pickup_Material;
				}
			}
		}

		if (SkelMesh_Gear_Female != NULL)
		{
			CharMats = SkelMesh_Gear_Female->Materials;

			for (int32 iMats = 0; iMats < CharMats.Num(); iMats++)
			{
				if (SkelMesh_Gear_Female->Materials[iMats].MaterialInterface == Pickup_Material_Origin)
				{
					SkelMesh_Gear_Female->Materials[iMats].MaterialInterface = Pickup_Material;
				}
			}
		}
	}

A possibility could be that the Material Instance “Pickup_Material” (which is declared in the parent class of this actor) causes the crash, because I am re-using it on a skeletal mesh of the child class. I read that this causes a memory leak in the packaged project. How can I resolve this?

Thanks in advance