Entering data into database iOS Objective-c

Trying to enter data from a form into a database, the code breaks when executing the sql statement.. not exactly sure why..

DBManager.m

-(BOOL)createDB{

        NSString* docDir;
        NSArray* dirPath;

        dirPath = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);

        docDir = dirPath[0];

        self.dbPath = [[NSString alloc]initWithString:[docDir stringByAppendingString:@"restaurant2.db" ]];

        NSFileManager *fmgr = [NSFileManager defaultManager];
        BOOL isSuccess = YES;
        if (![fmgr fileExistsAtPath:self.dbPath]) {
            const char* dbpath = [self.dbPath UTF8String];
            if (sqlite3_open(dbpath, &database)==SQLITE_OK) {
                char* errMsg;
                const char* sql_stmt =
                "create table if not exists restaurant(id integer primary key autoincrement, name text, address text, phone text,description text, tags text)";

                if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg)!=SQLITE_OK) {
                    isSuccess = NO;
                    NSLog(@"Failed to create database");

                }
                sqlite3_close(database);
                return isSuccess;
            }else{
                isSuccess=NO;
                NSLog(@"Failed to open/create database");
            }
        }


        return isSuccess;


}

-(BOOL)saveData:(NSString*)name address:(NSString*)address phone:(NSString*)phone description:(NSString*)description tags:(NSString*)tags{

    const char* dbpath = [self.dbPath UTF8String];

    BOOL res = YES;
    if(sqlite3_open(dbpath, &database)== SQLITE_OK){
        NSString *insertSQL = [NSString stringWithFormat:@"insert into restaurant(name, address, phone, description, tags) values (\"%@\",\"%@\",\"%@\",\"%@\"),\"%@\")", name,address,phone,description, tags];

        const char* insert_stmt = [insertSQL UTF8String];

        sqlite3_prepare(database, insert_stmt, -1, &statement, NULL);
        if (sqlite3_step(statement)!= SQLITE_DONE){
            NSLog(@"Failed to execute the query %@", insertSQL);
            res = NO;

        }
        sqlite3_reset(statement);
    }
    else{
        res = NO;
        NSLog(@"Failed to open database");
    }


                               return res;
}

addRestaurantController.m

- (IBAction)addRestaurant:(id)sender {

    BOOL success = NO;

    NSString* alertMSG = @"Insert Failed";
    if (self.name.text.length > 0 && self.address.text.length > 0){
        success = [[DBManager getSharedInstance] saveData:self.name.text address:self.address.text phone:self.phone.text description:self.descriptions.text tags:self.tags.text];
    }

    else{
        alertMSG= @"Enter the name and address at least";
    }
    if(!success){
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:alertMSG message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }

This is where I think its breaking located in DBManager.m

sqlite3_prepare(database, insert_stmt, -1, &statement, NULL);
        if (sqlite3_step(statement)!= SQLITE_DONE){
            NSLog(@"Failed to execute the query %@", insertSQL);
            res = NO;

        }