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--- src/vdbe.c
+++ src/vdbe.c
@@ -5323,17 +5323,17 @@
#ifndef SQLITE_OMIT_WAL
zFilename = sqlite3PagerFilename(pPager);
/* Do not allow a transition to journal_mode=WAL for a database
** in temporary storage or if the VFS does not support shared memory
*/
if( eNew==PAGER_JOURNALMODE_WAL
- && (zFilename[0]==0 /* Temp file */
+ && (zFilename==NULL || zFilename[0]==0 /* Temp file */
|| !sqlite3PagerWalSupported(pPager)) /* No shared-memory support */
){
eNew = eOld;
}
if( (eNew!=eOld)
&& (eOld==PAGER_JOURNALMODE_WAL || eNew==PAGER_JOURNALMODE_WAL)
){
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