diff --git a/imgui.cpp b/imgui.cpp
index 41ac8533..f89165b1 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -1925,6 +1925,8 @@ ImGuiWindow::~ImGuiWindow()
 {
     IM_DELETE(DrawList);
     IM_DELETE(Name);
+    for (int i = 0; i != ColumnsStorage.Size; i++)
+        ColumnsStorage[i].~ImGuiColumnsSet();
 }
 
 ImGuiID ImGuiWindow::GetID(const char* str, const char* str_end)
@@ -3066,15 +3068,16 @@ void ImGui::NewFrame()
     if (!g.Initialized)
         Initialize();
 
+    g.Time += g.IO.DeltaTime;
+    g.FrameCount += 1;
+    g.TooltipOverrideCount = 0;
+    g.WindowsActiveCount = 0;
+
     SetCurrentFont(GetDefaultFont());
     IM_ASSERT(g.Font->IsLoaded());
     g.DrawListSharedData.ClipRectFullscreen = ImVec4(0.0f, 0.0f, g.IO.DisplaySize.x, g.IO.DisplaySize.y);
     g.DrawListSharedData.CurveTessellationTol = g.Style.CurveTessellationTol;
 
-    g.Time += g.IO.DeltaTime;
-    g.FrameCount += 1;
-    g.TooltipOverrideCount = 0;
-    g.WindowsActiveCount = 0;
     g.OverlayDrawList.Clear();
     g.OverlayDrawList.PushTextureID(g.IO.Fonts->TexID);
     g.OverlayDrawList.PushClipRectFullScreen();
diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index 8fb60137..2cb2cbe0 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -1445,11 +1445,14 @@ void    ImFontAtlas::GetTexDataAsRGBA32(unsigned char** out_pixels, int* out_wid
     {
         unsigned char* pixels;
         GetTexDataAsAlpha8(&pixels, NULL, NULL);
-        TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc((size_t)(TexWidth * TexHeight * 4));
-        const unsigned char* src = pixels;
-        unsigned int* dst = TexPixelsRGBA32;
-        for (int n = TexWidth * TexHeight; n > 0; n--)
-            *dst++ = IM_COL32(255, 255, 255, (unsigned int)(*src++));
+        if (pixels)
+        {
+            TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc((size_t)(TexWidth * TexHeight * 4));
+            const unsigned char* src = pixels;
+            unsigned int* dst = TexPixelsRGBA32;
+            for (int n = TexWidth * TexHeight; n > 0; n--)
+                *dst++ = IM_COL32(255, 255, 255, (unsigned int)(*src++));
+        }
     }
 
     *out_pixels = (unsigned char*)TexPixelsRGBA32;
@@ -1689,6 +1692,7 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
         IM_ASSERT(font_offset >= 0);
         if (!stbtt_InitFont(&tmp.FontInfo, (unsigned char*)cfg.FontData, font_offset))
         {
+            atlas->TexWidth = atlas->TexHeight = 0; // Reset output on failure
             ImGui::MemFree(tmp_array);
             return false;
         }