arc4random() stopped working after project update, Thread 1: EXC_ARITHMETIC - cocos2d-iphone

Question

I got a warning on xcode 6.0.1 that I needed to update my project, so I did...
...but then I got issues with arc4random() % instead
Everything was working fine before this update, but now I get the following message:
"Thread 1: EXC_ARITHMETIC (code = EXC_1386_DIV, Subcode = 0x0) and the game crashes.
I tried with arc4random_uniform but the game seems to "pause" and nothing happens. What I mean is that I could see that it entered the if(bType == pt || bType == pl) statement but there is seems to "pause" and loop endlessly.
any suggestions?
-(void)placeInGrid:(CGPoint)place pt:(int)pt pl:(int)pl amount:(int)amountOfbricks{
CCLOG(#"BRICKS:placeInGrid");
//CCLOG(#"pt %d", pt);
//CCLOG(#"pl %d", pl);
int bType = arc4random() % amountOfbricks;
//int bType = arc4random_uniform(amountOfbricks);
if(bType == pt || bType == pl){
CCLOG(#"bType == pt || bType == pl");
[self placeInGrid:place pt:pt pl:pl amount:amountOfbricks];
return;
}
else{
CCLOG(#"else");
CCSpriteBatchNode * b = (CCSpriteBatchNode *)[theGame getChildByTag:kSSheet];
mySprite = [CCSprite spriteWithBatchNode:b rect:[self setBrickType:bType]];
[b addChild:mySprite z:1];
self.bricksType =bType;
[self.mySprite setPosition:place];
}
}
UPDATE:
the if-else statement below looks for saved data at the beginning of the game, to see if it´s a saved game or a new game.
The problem as it seems, after the project update is that the game thinks that there is already saved data and it goes to the first if statement ( if(gameData)), causing amountofbricks to be equal to 0, instead of going into the else statement where amountofbricks is equal to 4.
I don´t know how to solve this issue.
if ([[GameManager sharedGameManager] isContinuePressed] == NO && [[GameManager sharedGameManager] isNewPressed] == YES) {
if(gameData){
CCLOG(#"gameData && isContinuePressed == NO && isNewPressed == YES");
//Set the local instance of myobject to the object held in the gameState filler with the key "myObject"
level = 1;
[[GameManager sharedGameManager] setHScore:[decoder decodeIntegerForKey:#"HighScore"]];
highscore = [[GameManager sharedGameManager] ReturnHScore];
countTime = 300;
AmountOfBricks = [[GameManager sharedGameManager] ReturnAmountOfBricks];
BeginningOfGame = YES;
CCLOG(#"AmountOfBricks %d", AmountOfBricks);
}
else{
CCLOG(#"!gameData && isContinuePressed == NO && isNewPressed == YES");
if([[GameManager sharedGameManager]isThereASavedGame] ==YES){
CCLOG(#"isThereASavedGame == YES");
score = 0;
highscore = [[GameManager sharedGameManager] ReturnHScore];
level = 1;
countTime = 300;
AmountOfBricks = 4;
BeginningOfGame = YES;
CCLOG(#"AmountOfBricks %d", AmountOfBricks);
}
else{
CCLOG(#"isThereASavedGame == NO");
score = 0;
highscore = 0;
level = 1;
countTime = 300;
AmountOfBricks = 4;
BeginningOfGame = YES;
CCLOG(#"AmountOfBricks %d", AmountOfBricks);
}
}
}
UPDATE: I found the issue.
the issue was in my game manager.m file.
NSMutableData *gameData;
NSKeyedUnarchiver *decoder = nil;
NSString *documentPath = [documentsDirectory stringByAppendingPathComponent: #"gameState.dat"];
gameData = [NSData dataWithContentsOfFile:documentPath];//before the update, I as using this line. was working perfectly. after the update I got a warning on this line "incompatible pointer" and xcode recommended to update to the line below but the line below started to return a zero value. which caused the game to crash.
//gameData = [NSMutableData dataWithData:[NSData dataWithContentsOfFile:documentPath]];

Answer 1

I wager amountOfBricks is 0. You can't modulo by 0 like you can't divide by 0.