Conditional jump or move depends on uninitialised value(s)

i'm breaking my head for hours on the following problem: i pasted 2 functions althought there are many more. i run valgrind on my program and i get 32 errors similar to this:

==4214== 6 errors in context 8 of 10:
==4214== Conditional jump or move depends on uninitialised value(s)
==4214==    at 0x40088F: getNextFreeCell (in /a/fr-01/vol/home/stud/ashers03/c/ex4/test)
==4214==    by 0x400C7A: InsertObject (in /a/fr-01/vol/home/stud/ashers03/c/ex4/test)
==4214==    by 0x401137: main (in /a/fr-01/vol/home/stud/ashers03/c/ex4/test)  

i get more errors on other functions, however it's same error. i can't understand why it is uninitialized.

This is the main function:

int main(int argc, char* argv[]) {
     size_t tableSize = (size_t)atoi(*(argv+1));
     TableP table = CreateTable(tableSize,IntFcn, IntPrint,IntCompare);
     int i;
     for (i=FIRST; i<=LAST; i++) {
         int *key = (int*)malloc(sizeof(int));
         *key = i;

         ObjectP obj = CreateObject(key);
         InsertObject(table,obj);
     }
     PrintTable(table);
     FreeTable(table);
     return 0;
}

these definitions are in a header file:

typedef struct Object* ObjectP;
typedef struct Table* TableP;
typedef const struct Table* ConstTableP;
typedef enum {FALSE, TRUE} Boolean;

this code is in another file:

typedef struct Table {
    ObjectP* _table;
    int _firstTableSize;
    int _currentTableSize;
    int _increaseFactor;
    HashFcn _hfun;
    PrintFcn _pfun;
    ComparisonFcn _fcomp;
} Table;

typedef struct Object {

     ObjectP _next;
     void* _key;
     int _numInChain;
} Object;

this function inserts a key to a hashtable. If 3 keys are already chained in the cell then size of the table is doubled and I'm doing some other things in doubleTable()...

Boolean InsertObject(TableP table, ObjectP object) {

    int index=table->_increas