Index: src/test_fs.c
==================================================================
--- src/test_fs.c
+++ src/test_fs.c
@@ -543,10 +543,11 @@
         if( zQuery[i]=='/' ) nDir = i;
       }
       zDir = zQuery;
     }
   }
+  if( nDir==0 ) nDir = 1;
 
   sqlite3_bind_text(pCsr->pStmt, 1, zDir, nDir, SQLITE_TRANSIENT);
   sqlite3_bind_text(pCsr->pStmt, 2, zRoot, nRoot, SQLITE_TRANSIENT);
   sqlite3_bind_text(pCsr->pStmt, 3, zPrefix, nPrefix, SQLITE_TRANSIENT);