diff --git a/.github/workflows/root-ci.yml b/.github/workflows/root-ci.yml
index e7ab8750bca49..596dbdca497a1 100644
--- a/.github/workflows/root-ci.yml
+++ b/.github/workflows/root-ci.yml
@@ -96,9 +96,6 @@ jobs:
         # Common configs: {Release,Debug,RelWithDebInfo)
         # Build options: https://root.cern/install/build_from_source/#all-build-options
         include:
-          - platform: mac14
-            arch: X64
-            overrides: ["LLVM_ENABLE_ASSERTIONS=On", "CMAKE_CXX_STANDARD=20"]
           - platform: mac15
             arch: ARM64
             overrides: ["LLVM_ENABLE_ASSERTIONS=On", "CMAKE_CXX_STANDARD=20"]
diff --git a/graf2d/asimage/src/libAfterImage/libjpeg/jquant1.c b/graf2d/asimage/src/libAfterImage/libjpeg/jquant1.c
index b2f96aa15d25d..d6abaf7beeb26 100644
--- a/graf2d/asimage/src/libAfterImage/libjpeg/jquant1.c
+++ b/graf2d/asimage/src/libAfterImage/libjpeg/jquant1.c
@@ -528,6 +528,10 @@ quantize_ord_dither (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
   JDIMENSION col;
   JDIMENSION width = cinfo->output_width;
 
+  if (output_buf == NULL && num_rows) {
+    ERREXIT(cinfo, JERR_BAD_PARAM);
+  }
+
   for (row = 0; row < num_rows; row++) {
     /* Initialize output values to 0 so can process components separately */
     jzero_far((void FAR *) output_buf[row],