diff --git a/doomsday/client/src/audio/s_mus.cpp b/doomsday/client/src/audio/s_mus.cpp
index 6952467286..b112cd8cfe 100644
--- a/doomsday/client/src/audio/s_mus.cpp
+++ b/doomsday/client/src/audio/s_mus.cpp
@@ -229,7 +229,7 @@ int Mus_GetExt(ded_music_t *def, ddstring_t *retPath)
 {
     LOG_AS("Mus_GetExt");
 
-    if(!musAvail || !AudioDriver_Music_Available()) return false;
+    if(!musAvail || !AudioDriver_Music_Available() || !def) return false;
 
     if(def->path && !Str_IsEmpty(Uri_Path(def->path)))
     {
diff --git a/doomsday/client/src/gl/dgl_common.cpp b/doomsday/client/src/gl/dgl_common.cpp
index 5d46a22bfc..4cb4f9b58c 100644
--- a/doomsday/client/src/gl/dgl_common.cpp
+++ b/doomsday/client/src/gl/dgl_common.cpp
@@ -454,7 +454,7 @@ dd_bool DGL_GetIntegerv(int name, int *v)
 #undef DGL_GetInteger
 int DGL_GetInteger(int name)
 {
-    int values[10];
+    int values[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
     DGL_GetIntegerv(name, values);
     return values[0];
 }
diff --git a/doomsday/client/src/gl/gl_tex.cpp b/doomsday/client/src/gl/gl_tex.cpp
index 501c04b8fc..60dd4bde88 100644
--- a/doomsday/client/src/gl/gl_tex.cpp
+++ b/doomsday/client/src/gl/gl_tex.cpp
@@ -312,6 +312,7 @@ static void* packImage(int components, const float* tempOut, GLint typeOut,
         break;
       }
     default:
+        DENG_ASSERT(!"packImage: Unknown output type");
         return 0;
     }
 
diff --git a/doomsday/client/src/render/rend_main.cpp b/doomsday/client/src/render/rend_main.cpp
index 95031e850f..d6b0d0bd59 100644
--- a/doomsday/client/src/render/rend_main.cpp
+++ b/doomsday/client/src/render/rend_main.cpp
@@ -980,6 +980,8 @@ static void quadShinyTexCoords(Vector2f *tc, Vector3f const *topLeft,
 
 static void flatShinyTexCoords(Vector2f *tc, Vector3f const &point)
 {
+    DENG_ASSERT(tc);
+
     // Determine distance to viewer.
     float distToEye = Vector2f(vOrigin.x - point.x, vOrigin.z - point.y)
                           .normalize().length();
diff --git a/doomsday/client/src/world/maputil.cpp b/doomsday/client/src/world/maputil.cpp
index 087ff58846..6357c4edd5 100644
--- a/doomsday/client/src/world/maputil.cpp
+++ b/doomsday/client/src/world/maputil.cpp
@@ -263,6 +263,8 @@ static bool middleMaterialCoversOpening(LineSide const &side)
 Line *R_FindSolidLineNeighbor(Sector const *sector, Line const *line,
     LineOwner const *own, bool antiClockwise, binangle_t *diff)
 {
+    DENG_ASSERT(sector);
+
     LineOwner const *cown = antiClockwise? &own->prev() : &own->next();
     Line *other = &cown->line();