Index: src/shell.c
==================================================================
--- src/shell.c
+++ src/shell.c
@@ -1849,11 +1849,11 @@
       rc = 1;
     }
   }else
 #endif
 
-  if( c=='l' && strncmp(azArg[0], "log", n)==0 && nArg>=1 ){
+  if( c=='l' && strncmp(azArg[0], "log", n)==0 && nArg>=2 ){
     const char *zFile = azArg[1];
     if( p->pLog && p->pLog!=stdout && p->pLog!=stderr ){
       fclose(p->pLog);
       p->pLog = 0;
     }