Public bug reported:
<!-- Copy-paste this whole debug data to report to developers -->
```
GNU Image Manipulation Program version 2.99.8
git-describe: GIMP_2_99_8
Build: unknown rev 0 for linux
# C compiler #
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
9.3.0-17ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-gnu-unique-object --disable-vtable-verify --enable-plugin
--enable-default-pie --with-system-zlib --with-target-system-zlib=auto
--enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic
--enable-offload-targets=nvptx-none=/build/gcc-9-HskZEa/gcc-9-9.3.0/debian/tmp-nvptx/usr,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
# Libraries #
using babl version 0.1.88 (compiled against version 0.1.88)
using GEGL version 0.4.34 (compiled against version 0.4.34)
using GLib version 2.68.4 (compiled against version 2.68.4)
using GdkPixbuf version 2.40.0 (compiled against version 2.40.0)
using GTK+ version 3.24.20 (compiled against version 3.24.20)
using Pango version 1.44.7 (compiled against version 1.44.7)
using Fontconfig version 2.13.1 (compiled against version 2.13.1)
using Cairo version 1.16.0 (compiled against version 1.16.0)
```
> GIMP-CRITICAL: gimp_image_get_resolution: assertion 'GIMP_IS_IMAGE (image)'
> failed
Stack trace:
```
/lib/x86_64-linux-gnu/libgimpbase-3.0.so.0(gimp_stack_trace_print+0x398)
[0x7f8f7d32f518]
gimp-2.99(gui_message+0x2da) [0x55fb1acb8e3a]
gimp-2.99(gimp_show_message+0x100) [0x55fb1af99a30]
gimp-2.99(+0xee7f5) [0x55fb1acad7f5]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_logv+0x21c) [0x7f8f7c85a8ac]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_log+0x93) [0x7f8f7c85aa93]
gimp-2.99(+0x1fbbb2) [0x55fb1adbabb2]
gimp-2.99(+0x1fbc9d) [0x55fb1adbac9d]
gimp-2.99(+0x1f103d) [0x55fb1adb003d]
/lib/x86_64-linux-gnu/libgtk-3.so.0(+0x39367e) [0x7f8f7d83667e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_closure_invoke+0x18e)
[0x7f8f7c948e9e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(+0x28e3c) [0x7f8f7c95ce3c]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_signal_emit_valist+0x10ce)
[0x7f8f7c96829e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_signal_emit+0x93) [0x7f8f7c9687d3]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x46ea7) [0x7f8f7d3e4ea7]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x30f4d) [0x7f8f7d3cef4d]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x54e08) [0x7f8f7c853e08]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x14e)
[0x7f8f7c85326e]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x54620) [0x7f8f7c853620]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0x83) [0x7f8f7c853913]
gimp-2.99(app_run+0x311) [0x55fb1acad3d1]
gimp-2.99(main+0x3b8) [0x55fb1acaccf8]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f8f7c4ba0b3]
gimp-2.99(_start+0x2e) [0x55fb1acace7e]
```
> GIMP-CRITICAL: gimp_image_get_resolution: assertion 'GIMP_IS_IMAGE (image)'
> failed
Stack trace:
```
/lib/x86_64-linux-gnu/libgimpbase-3.0.so.0(gimp_stack_trace_print+0x398)
[0x7f8f7d32f518]
gimp-2.99(gui_message+0x2da) [0x55fb1acb8e3a]
gimp-2.99(gimp_show_message+0x100) [0x55fb1af99a30]
gimp-2.99(+0xee7f5) [0x55fb1acad7f5]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_logv+0x21c) [0x7f8f7c85a8ac]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_log+0x93) [0x7f8f7c85aa93]
gimp-2.99(+0x1fbc2b) [0x55fb1adbac2b]
gimp-2.99(+0x1fbc9d) [0x55fb1adbac9d]
gimp-2.99(+0x1f103d) [0x55fb1adb003d]
/lib/x86_64-linux-gnu/libgtk-3.so.0(+0x39367e) [0x7f8f7d83667e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_closure_invoke+0x18e)
[0x7f8f7c948e9e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(+0x28e3c) [0x7f8f7c95ce3c]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_signal_emit_valist+0x10ce)
[0x7f8f7c96829e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_signal_emit+0x93) [0x7f8f7c9687d3]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x46ea7) [0x7f8f7d3e4ea7]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x30f4d) [0x7f8f7d3cef4d]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x54e08) [0x7f8f7c853e08]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x14e)
[0x7f8f7c85326e]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x54620) [0x7f8f7c853620]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0x83) [0x7f8f7c853913]
gimp-2.99(app_run+0x311) [0x55fb1acad3d1]
gimp-2.99(main+0x3b8) [0x55fb1acaccf8]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f8f7c4ba0b3]
gimp-2.99(_start+0x2e) [0x55fb1acace7e]
```
> GIMP-CRITICAL: gimp_image_get_width: assertion 'GIMP_IS_IMAGE (image)' failed
Stack trace:
```
/lib/x86_64-linux-gnu/libgimpbase-3.0.so.0(gimp_stack_trace_print+0x398)
[0x7f8f7d32f518]
gimp-2.99(gui_message+0x2da) [0x55fb1acb8e3a]
gimp-2.99(gimp_show_message+0x100) [0x55fb1af99a30]
gimp-2.99(+0xee7f5) [0x55fb1acad7f5]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_logv+0x21c) [0x7f8f7c85a8ac]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_log+0x93) [0x7f8f7c85aa93]
gimp-2.99(gimp_image_get_width+0x5a) [0x55fb1b00794a]
gimp-2.99(+0x1fbcaa) [0x55fb1adbacaa]
gimp-2.99(+0x1f103d) [0x55fb1adb003d]
/lib/x86_64-linux-gnu/libgtk-3.so.0(+0x39367e) [0x7f8f7d83667e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_closure_invoke+0x18e)
[0x7f8f7c948e9e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(+0x28e3c) [0x7f8f7c95ce3c]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_signal_emit_valist+0x10ce)
[0x7f8f7c96829e]
/lib/x86_64-linux-gnu/libgobject-2.0.so.0(g_signal_emit+0x93) [0x7f8f7c9687d3]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x46ea7) [0x7f8f7d3e4ea7]
/lib/x86_64-linux-gnu/libgdk-3.so.0(+0x30f4d) [0x7f8f7d3cef4d]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x54e08) [0x7f8f7c853e08]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x14e)
[0x7f8f7c85326e]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x54620) [0x7f8f7c853620]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0x83) [0x7f8f7c853913]
gimp-2.99(app_run+0x311) [0x55fb1acad3d1]
gimp-2.99(main+0x3b8) [0x55fb1acaccf8]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f8f7c4ba0b3]
gimp-2.99(_start+0x2e) [0x55fb1acace7e]
```
> GIMP-CRITICAL: gimp_image_get_height: assertion 'GIMP_IS_IMAGE (image)' failed
** Affects: gimp (Ubuntu)
Importance: Undecided
Status: New
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1962440
Title:
'GIMP_IS_IMAGE (image)' failed
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