App runs fine in Debug mode but crashes in Release mode with sqlite

Question

I have a problem with an app developed using Xcode. It runs well in Debug but crashes in Release on a SQLite statement:

if (sqlite3_prepare_v2(database, sql, -1, &init_statement, NULL) != SQLITE_OK) {
NSAssert1(NO, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database));
}
if (sqlite3_step(init_statement) == SQLITE_ROW) {
... }

In Release mode it crashed at the line sqlite3_step(init_statement) == SQLITE_ROW with this error:

Program received signal: "EXC_BAD_ACCESS".

The following is the message I got before crashing:

[Switching to process 7939 thread 0x1f03]

There is no problem found in Debug mode.

Thanks for any help!