diff --git a/src/ZoneLoading/Zone/Stream/ZoneInputStream.cpp b/src/ZoneLoading/Zone/Stream/ZoneInputStream.cpp
index baae3606..ddc73227 100644
--- a/src/ZoneLoading/Zone/Stream/ZoneInputStream.cpp
+++ b/src/ZoneLoading/Zone/Stream/ZoneInputStream.cpp
@@ -387,6 +387,7 @@ namespace
             uintptr_t lookupEntry = 0u;
             std::memcpy(&lookupEntry, &block->m_buffer[blockOffset], m_pointer_byte_count);
 
+            assert(lookupEntry != 0);
             if (lookupEntry == 0)
                 return nullptr;
             if (lookupEntry > m_pointer_redirect_lookup.size())