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-rw-r--r--src/mame/video/neogeo_spr.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/video/neogeo_spr.cpp b/src/mame/video/neogeo_spr.cpp
index a53d09b871d..ea4fd41fd88 100644
--- a/src/mame/video/neogeo_spr.cpp
+++ b/src/mame/video/neogeo_spr.cpp
@@ -177,6 +177,7 @@ void neosprite_base_device::neogeo_set_fixed_layer_source(uint8_t data)
void neosprite_base_device::draw_fixed_layer(bitmap_rgb32 &bitmap, int scanline)
{
+ assert((m_fixed_layer_source && m_region_fixed != nullptr) || (m_region_fixedbios != nullptr));
int x;
uint8_t* gfx_base = m_fixed_layer_source ? m_region_fixed : m_region_fixedbios->base();