diff --git a/src/graphics/sp/sp_texture.cpp b/src/graphics/sp/sp_texture.cpp
index 2ac799941..a8e73bede 100644
--- a/src/graphics/sp/sp_texture.cpp
+++ b/src/graphics/sp/sp_texture.cpp
@@ -522,7 +522,8 @@ std::shared_ptr<video::IImage>
     {
         // Load colorization mask
         std::shared_ptr<video::IImage> mask;
-        if (SP::getSPShader(m_material->getShaderName())->useAlphaChannel())
+        SPShader* sps = SP::getSPShader(m_material->getShaderName());
+        if (sps && sps->useAlphaChannel())
         {
             Log::debug("SPTexture", "Don't use colorization mask or factor"
                 " with shader using alpha channel for %s", m_path.c_str());
diff --git a/src/modes/world.cpp b/src/modes/world.cpp
index db4468b6a..1781cab81 100644
--- a/src/modes/world.cpp
+++ b/src/modes/world.cpp
@@ -730,7 +730,8 @@ void World::resetAllKarts()
     for (KartList::iterator i = m_karts.begin(); i != m_karts.end(); i++)
     {
         if ((*i)->isGhostKart()) continue;
-        (*i)->getBody()->setGravity((*i)->getMaterial()->hasGravity() ?
+        (*i)->getBody()->setGravity(
+            (*i)->getMaterial() && (*i)->getMaterial()->hasGravity() ?
             (*i)->getNormal() * -g : Vec3(0, -g, 0));
     }
     for(int i=0; i<60; i++) Physics::getInstance()->update(1.f/60.f);