diff --git a/src/framework/graphics/graphics.cpp b/src/framework/graphics/graphics.cpp
index a791af5e..97738a1c 100644
--- a/src/framework/graphics/graphics.cpp
+++ b/src/framework/graphics/graphics.cpp
@@ -43,17 +43,9 @@ void Graphics::init()
        !GLEW_ARB_fragment_program || !GLEW_ARB_fragment_shader ||
        !GLEW_ARB_texture_non_power_of_two || !GLEW_ARB_multitexture)
         logFatal("Some OpenGL 2.0 extensions is not supported by your system graphics, please try updating your video drivers or buy a new hardware.");
-    m_useFBO = GLEW_ARB_framebuffer_object;
-    m_useBilinearFiltering = true;
-    m_generateMipmaps = true;
-    m_generateHardwareMipmaps = m_useFBO; // glGenerateMipmap is supported when FBO is
-    m_generateRealtimeMipmaps = m_generateHardwareMipmaps;
-#else
-    m_useFBO = true; // FBOs is always supported by mobile devices
-    m_useBilinearFiltering = true;
-    m_generateMipmaps = true;
-    m_generateHardwareMipmaps = true;
-    m_realtimeMipmapGeneration = false; // realtime mipmaps can be slow on mobile devices
+
+    m_useFBO = m_useFBO && GLEW_ARB_framebuffer_object;
+    m_generateHardwareMipmaps = m_generateHardwareMipmaps && m_useFBO; // glGenerateMipmap is supported when FBO is
 #endif
 
     glEnable(GL_BLEND);
diff --git a/src/framework/graphics/graphics.h b/src/framework/graphics/graphics.h
index 4eeedf8f..fdeaf89d 100644
--- a/src/framework/graphics/graphics.h
+++ b/src/framework/graphics/graphics.h
@@ -52,10 +52,10 @@ private:
     Size m_viewportSize;
     TexturePtr m_emptyTexture;
 
-    Boolean<false> m_useFBO;
-    Boolean<false> m_useBilinearFiltering;
-    Boolean<false> m_generateMipmaps;
-    Boolean<false> m_generateHardwareMipmaps;
+    Boolean<true> m_useFBO;
+    Boolean<true> m_useBilinearFiltering;
+    Boolean<true> m_generateMipmaps;
+    Boolean<true> m_generateHardwareMipmaps;
     Boolean<false> m_generateRealtimeMipmaps;
 };
 
diff --git a/src/otclient/core/mapview.cpp b/src/otclient/core/mapview.cpp
index 91990366..6273565c 100644
--- a/src/otclient/core/mapview.cpp
+++ b/src/otclient/core/mapview.cpp
@@ -519,7 +519,7 @@ int MapView::getLastVisibleFloor()
 
     // view only underground floors when below sea level
     if(cameraPosition.z > Otc::SEA_FLOOR)
-        return cameraPosition.z + Otc::AWARE_UNDEGROUND_FLOOR_RANGE;
+        return std::min(cameraPosition.z + Otc::AWARE_UNDEGROUND_FLOOR_RANGE, (int)Otc::MAX_Z);
     else
         return Otc::SEA_FLOOR;
 }
diff --git a/src/otclient/core/thingstype.cpp b/src/otclient/core/thingstype.cpp
index bc2bbc84..c9e0c299 100644
--- a/src/otclient/core/thingstype.cpp
+++ b/src/otclient/core/thingstype.cpp
@@ -115,12 +115,15 @@ void ThingsType::parseThingType(std::stringstream& fin, ThingType& thingType)
 
 ThingType *ThingsType::getThingType(uint16 id, Categories category)
 {
+    if(id == 0)
+        return &m_emptyThingType;
+
     if(category == Item)
         id -= 100;
     else if(category == Creature || category == Effect || category == Missile)
         id -= 1;
 
-    if(id == 0 || id >= m_things[category].size())
+    if(id >= m_things[category].size())
         return &m_emptyThingType;
     return &m_things[category][id];
 }