Index: src/whereexpr.c
==================================================================
--- src/whereexpr.c
+++ src/whereexpr.c
@@ -276,11 +276,11 @@
         ** be converted into "x<0", which is incorrect.
         */
         if( sqlite3Isdigit(zNew[0])
          || zNew[0]=='-'
          || zNew[0]=='+'
-         || (zNew[0]+1=='0' && iTo==1)
+         || (iTo>0 && zNew[iTo-1]=='0'-1)
         ){
           if( pLeft->op!=TK_COLUMN 
            || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT 
            || IsVirtual(pLeft->y.pTab)  /* Value might be numeric */
           ){

Index: test/like3.test
==================================================================
--- test/like3.test
+++ test/like3.test
@@ -177,18 +177,29 @@
   QUERY PLAN
   `--SEARCH TABLE t5b USING COVERING INDEX sqlite_autoindex_t5b_1 (x>? AND x<?)
 }
 
 # 2019-05-01
-# another case of the above reported on the mailing list by Manual Rigger.
+# another case of the above reported on the mailing list by Manuel Rigger.
 #
 do_execsql_test like3-5.300 {
   CREATE TABLE t5c (c0 REAL);
   CREATE INDEX t5c_0 ON t5c(c0 COLLATE NOCASE);
   INSERT INTO t5c(rowid, c0) VALUES (99,'+/');
   SELECT * FROM t5c WHERE (c0 LIKE '+/');
 } {+/}
+
+# 2019-05-08
+# Yet another case for the above from Manuel Rigger.
+#
+do_execsql_test like3-5.400 {
+  DROP TABLE IF EXISTS t0;
+  CREATE TABLE t0(c0 INT UNIQUE COLLATE NOCASE);
+  INSERT INTO t0(c0) VALUES ('./');
+  SELECT * FROM t0 WHERE t0.c0 LIKE './';
+} {./}
+
 
 # 2019-02-27
 # Verify that the LIKE optimization works with an ESCAPE clause when
 # using PRAGMA case_sensitive_like=ON.
 #