C free() double free or corruption (global array) - c

Question

Here is a struct in header-file:
typedef struct Missile {
int id;
Model *model;
Point3D coords;
int counter;
float speed;
float yaw;
float pitch;
float roll;
} Missile;
and here is code from C-file:
#define INIT_MISSILE_ARRAY_SIZE 4
/* An array to keep track of all missiles created (fired) */
static Missile *missiles[INIT_MISSILE_ARRAY_SIZE];
/* This keeps track of the array missiles' size */
int currentArraySize = INIT_MISSILE_ARRAY_SIZE;
int numOfMissiles = 0;
Missile *CreateMissile()
{
if (numOfMissiles < currentArraySize)
{
Missile *missile = malloc(sizeof(Missile));
missile->model = LoadModelPlus("rocket1.obj");
missile->counter = 0;
missile->speed = 0.00;
missile->yaw = 0.00;
missile->pitch = 0.00;
missile->roll = 0.00;
missile->id = numOfMissiles;
missiles[numOfMissiles] = missile;
numOfMissiles++;
printf("Missile created, numOfMissiles: %d\n", numOfMissiles);
return missile;
}
printf("Too many missiles fired already.\n");
return NULL;
}
void DeleteMissile(Missile *missile)
{
free(missile);
}
gives me this error: double free or corruption (fasttop): 0x000000000234f5d0
when the function DeleteMissile(Missile *missile) is called. I have tried replacing free(missile); with free(missiles[missile->id]);, which finds the (same) missile in the global array of missiles and calls free() on that one, and this gives me the same error. The function LoadModelPlus() uses malloc for the missile->model.
Can anyone see what I'm doing wrong?