Index: src/alter.c
==================================================================
--- src/alter.c
+++ src/alter.c
@@ -1021,10 +1021,14 @@
     if( bFKOnly==0 ){
       sCtx.pList = renameTokenFind(
           &sParse, (void*)sParse.pNewTable->aCol[sCtx.iCol].zName
       );
       sCtx.nList = 1;
+      assert( sCtx.iCol>=0 );
+      if( sParse.pNewTable->iPKey==sCtx.iCol ){
+        sCtx.iCol = -1;
+      }
       sqlite3WalkExprList(&sWalker, sParse.pNewTable->pCheck);
       for(pIdx=sParse.pNewTable->pIndex; pIdx; pIdx=pIdx->pNext){
         sqlite3WalkExprList(&sWalker, pIdx->aColExpr);
       }
     }

Index: test/altercol.test
==================================================================
--- test/altercol.test
+++ test/altercol.test
@@ -180,8 +180,25 @@
 } {2 5}
 
 do_catchsql_test 6.1 {
   ALTER TABLE sqlite_stat1 RENAME tbl TO thetable;
 } {1 {table sqlite_stat1 may not be altered}}
+
+#-------------------------------------------------------------------------
+do_execsql_test 6.0 {
+  CREATE TABLE blob(
+    rid INTEGER PRIMARY KEY,
+    rcvid INTEGER,
+    size INTEGER,
+    uuid TEXT UNIQUE NOT NULL,
+    content BLOB,
+    CHECK( length(uuid)>=40 AND rid>0 )
+  );
+}
+
+breakpoint
+do_execsql_test 6.1 {
+  ALTER TABLE "blob" RENAME COLUMN "rid" TO "a1";
+}
 
 finish_test