diff --git a/linker/linker_namespaces.h b/linker/linker_namespaces.h
index 03520d7..cd8b09d 100644
--- a/linker/linker_namespaces.h
+++ b/linker/linker_namespaces.h
@@ -54,6 +54,9 @@
   }
 
   bool is_accessible(const char* soname) const {
+    if (soname == nullptr) {
+      return false;
+    }
     return allow_all_shared_libs_ || shared_lib_sonames_.find(soname) != shared_lib_sonames_.end();
   }