Stack trace:

#0: line: if (unlikely(__pyx_get_slice_count(memview) <= 0))
context:
static CYTHON_INLINE void __Pyx_XDEC_MEMVIEW(__Pyx_memviewslice *memslice,
                                             int have_gil, int lineno) {
    int last_time;
    struct __pyx_memoryview_obj *memview = memslice->memview;
    if (unlikely(!memview || (PyObject *) memview == Py_None)) {
        memslice->memview = NULL;
        return;
    }
    if (unlikely(__pyx_get_slice_count(memview) <= 0))
        __pyx_fatalerror("Acquisition count is %d (line %d)",
                         __pyx_get_slice_count(memview), lineno);
    last_time = __pyx_sub_acquisition_count(memview) == 1;
    memslice->data = NULL;
    if (unlikely(last_time)) {
        if (have_gil) {
            Py_CLEAR(memslice->memview);
        } else {
            PyGILState_STATE _gilstate = PyGILState_Ensure();
            Py_CLEAR(memslice->memview);
            PyGILState_Release(_gilstate);
        }
    } else {
        memslice->memview = NULL;
    }
}

#1 line: __PYX_XDEC_MEMVIEW(&__pyx_v_tilecache, 1);
context:

        /* "pyboy/core/lcd.py":936
 *                 else:
 *                     self.update_tilecache0(lcd, bt, vbank)
 *                     tilecache = self._tilecache0             # <<<<<<<<<<<<<<
 *
 *             if b_horiflip:
 */
        if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
          PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "_tilecache0");
          __PYX_ERR(0, 936, __pyx_L1_error)
        }
        if (unlikely(!__pyx_v_self->__pyx_base._tilecache0.memview)) {PyErr_SetString(PyExc_AttributeError,"Memoryview is not initialized");__PYX_ERR(0, 936, __pyx_L1_error)}
        __pyx_t_13 = __pyx_v_self->__pyx_base._tilecache0;
        __PYX_INC_MEMVIEW(&__pyx_t_13, 1);
        __PYX_XDEC_MEMVIEW(&__pyx_v_tilecache, 1);
        __pyx_v_tilecache = __pyx_t_13;
        __pyx_t_13.memview = NULL;
        __pyx_t_13.data = NULL;
      }
      __pyx_L8:;

#2 line: (void)(((struct __pyx_vtabstruct_5pyboy_4core_3lcd_CGBRenderer *)__pyx_v_self->__pyx_base.__pyx_vtab)->__pyx_base.scanline_background(((struct
context:

  /* "pyboy/core/lcd.py":966
 *         else:  # background_enable doesn't exist for CGB. It works as master priority instead
 *             # No window
 *             self.scanline_background(y, x, bx, by, COLS, lcd)             # <<<<<<<<<<<<<<
 *
 *         if y == 143:
 */
  /*else*/ {
    if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
      PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "scanline_background");
      __PYX_ERR(0, 966, __pyx_L1_error)
    }
    (void)(((struct __pyx_vtabstruct_5pyboy_4core_3lcd_CGBRenderer *)__pyx_v_self->__pyx_base.__pyx_vtab)->__pyx_base.scanline_background(((struct __pyx_obj_5pyboy_4core_3lcd_Renderer *)__pyx_v_self), __pyx_v_y, __pyx_v_x, __pyx_v_bx, __pyx_v_by, __pyx_v_5pyboy_4core_3lcd_COLS, __pyx_v_lcd));
  }
  __pyx_L4:;


#3 line: ((struct __pyx_vtabstruct_5pyboy_4core_3lcd_Renderer *)__pyx_v_self->renderer->__pyx_vtab)->scanline(__pyx_v_self->renderer, __pyx_v_self,
context:

        /* "pyboy/core/lcd.py":206
 *                     self._scanlineparameters[self.LY][4] = self._LCDC.tiledata_select
 *
 *                     self.renderer.scanline(self, self.LY)             # <<<<<<<<<<<<<<
 *                     self.renderer.scanline_sprites(
 *                         self, self.LY, self.renderer._screenbuffer, self.renderer._screenbuffer_attributes, False
 */
        if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
          PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "renderer");
          __PYX_ERR(0, 206, __pyx_L1_error)
        }
        if (unlikely(((PyObject *)__pyx_v_self->renderer) == Py_None)) {
          PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "scanline");
          __PYX_ERR(0, 206, __pyx_L1_error)
        }
        if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
          PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "LY");
          __PYX_ERR(0, 206, __pyx_L1_error)
        }
        ((struct __pyx_vtabstruct_5pyboy_4core_3lcd_Renderer *)__pyx_v_self->renderer->__pyx_vtab)->scanline(__pyx_v_self->renderer, __pyx_v_self, __pyx_v_self->LY);

#4 line:  __pyx_v_lcd_interrupt = ((struct __pyx_vtabstruct_5pyboy_4core_3lcd_LCD *)__pyx_v_self->lcd->__pyx_vtab)->tick(__pyx_v_self->lcd, __pyx_v_self->cpu->cycles);
context:

      /* "pyboy/core/mb.py":418
 *                 return self.sound.get(i - 0xFF10)
 *             elif 0xFF40 <= i <= 0xFF4B:
 *                 lcd_interrupt = self.lcd.tick(self.cpu.cycles)             # <<<<<<<<<<<<<<
 *                 if lcd_interrupt:
 *                     self.cpu.set_interruptflag(lcd_interrupt)
 */
      if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
        PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "lcd");
        __PYX_ERR(0, 418, __pyx_L1_error)
      }
      if (unlikely(((PyObject *)__pyx_v_self->lcd) == Py_None)) {
        PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "tick");
        __PYX_ERR(0, 418, __pyx_L1_error)
      }
      if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
        PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "cpu");
        __PYX_ERR(0, 418, __pyx_L1_error)
      }
      if (unlikely(((PyObject *)__pyx_v_self->cpu) == Py_None)) {
        PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "cycles");
        __PYX_ERR(0, 418, __pyx_L1_error)
      }
      __pyx_v_lcd_interrupt = ((struct __pyx_vtabstruct_5pyboy_4core_3lcd_LCD *)__pyx_v_self->lcd->__pyx_vtab)->tick(__pyx_v_self->lcd, __pyx_v_self->cpu->cycles);

#5


#9 line: (void)(((struct __pyx_vtabstruct_5pyboy_4core_3cpu_CPU *)__pyx_v_self->cpu->__pyx_vtab)->tick(__pyx_v_self->cpu, __pyx_v_cycles_target));
context:
      /* "pyboy/core/mb.py":336
 *                 if self.breakpoint_singlestep:
 *                     cycles_target = 4
 *                 self.cpu.tick(cycles_target)             # <<<<<<<<<<<<<<
 *
 *             # TODO: Support General Purpose DMA
 */
      if (unlikely(((PyObject *)__pyx_v_self) == Py_None)) {
        PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "cpu");
        __PYX_ERR(0, 336, __pyx_L1_error)
      }
      if (unlikely(((PyObject *)__pyx_v_self->cpu) == Py_None)) {
        PyErr_Format(PyExc_AttributeError, "'NoneType' object has no attribute '%.30s'", "tick");
        __PYX_ERR(0, 336, __pyx_L1_error)
      }
      (void)(((struct __pyx_vtabstruct_5pyboy_4core_3cpu_CPU *)__pyx_v_self->cpu->__pyx_vtab)->tick(__pyx_v_self->cpu, __pyx_v_cycles_target));
    }
    __pyx_L5:;