diff --git a/components/esm/esmreader.cpp b/components/esm/esmreader.cpp
index 316748b53a..c84a1798ff 100644
--- a/components/esm/esmreader.cpp
+++ b/components/esm/esmreader.cpp
@@ -24,6 +24,7 @@ ESMReader::ESMReader()
     , mFileSize(0)
 {
     clearCtx();
+    mCtx.index = 0;
 }
 
 void ESMReader::restoreContext(const ESM_Context &rc)