--- a/gfx/layers/client/TextureClient.cpp
+++ b/gfx/layers/client/TextureClient.cpp
@@ -1580,20 +1580,20 @@ int32_t
 ShmemTextureReadLock::ReadUnlock() {
   if (!mAllocSuccess) {
     return 0;
   }
   ShmReadLockInfo* info = GetShmReadLockInfoPtr();
   int32_t readCount = PR_ATOMIC_DECREMENT(&info->readCount);
   MOZ_ASSERT(readCount >= 0);
   if (readCount <= 0) {
-    if (mClientAllocator) {
+    if (mClientAllocator && mClientAllocator->GetTileLockAllocator()) {
       mClientAllocator->GetTileLockAllocator()->DeallocShmemSection(mShmemSection);
     } else {
-      // we are on the compositor process
+      // we are on the compositor process, or IPC is down.
       FixedSizeSmallShmemSectionAllocator::FreeShmemSection(mShmemSection);
     }
   }
   return readCount;
 }
 
 int32_t
 ShmemTextureReadLock::GetReadCount() {

--- a/gfx/layers/ipc/CompositorBridgeChild.cpp
+++ b/gfx/layers/ipc/CompositorBridgeChild.cpp
@@ -1023,17 +1023,16 @@ CompositorBridgeChild::ClearTexturePool(
   for (size_t i = 0; i < mTexturePools.Length(); i++) {
     mTexturePools[i]->Clear();
   }
 }
 
 FixedSizeSmallShmemSectionAllocator*
 CompositorBridgeChild::GetTileLockAllocator()
 {
-  MOZ_ASSERT(IPCOpen());
   if (!IPCOpen()) {
     return nullptr;
   }
 
   if (!mSectionAllocator) {
     mSectionAllocator = new FixedSizeSmallShmemSectionAllocator(this);
   }
   return mSectionAllocator;