diff --git a/libavutil/pixdesc.c b/libavutil/pixdesc.c
index ff5c20d50e..96e079584a 100644
--- a/libavutil/pixdesc.c
+++ b/libavutil/pixdesc.c
@@ -2737,7 +2737,12 @@ int av_color_primaries_from_name(const char *name)
     int i;
 
     for (i = 0; i < FF_ARRAY_ELEMS(color_primaries_names); i++) {
-        size_t len = strlen(color_primaries_names[i]);
+        size_t len;
+
+        if (!color_primaries_names[i])
+            continue;
+
+        len = strlen(color_primaries_names[i]);
         if (!strncmp(color_primaries_names[i], name, len))
             return i;
     }
@@ -2756,7 +2761,12 @@ int av_color_transfer_from_name(const char *name)
     int i;
 
     for (i = 0; i < FF_ARRAY_ELEMS(color_transfer_names); i++) {
-        size_t len = strlen(color_transfer_names[i]);
+        size_t len;
+
+        if (!color_transfer_names[i])
+            continue;
+
+        len = strlen(color_transfer_names[i]);
         if (!strncmp(color_transfer_names[i], name, len))
             return i;
     }
@@ -2775,7 +2785,12 @@ int av_color_space_from_name(const char *name)
     int i;
 
     for (i = 0; i < FF_ARRAY_ELEMS(color_space_names); i++) {
-        size_t len = strlen(color_space_names[i]);
+        size_t len;
+
+        if (!color_space_names[i])
+            continue;
+
+        len = strlen(color_space_names[i]);
         if (!strncmp(color_space_names[i], name, len))
             return i;
     }
@@ -2794,7 +2809,12 @@ int av_chroma_location_from_name(const char *name)
     int i;
 
     for (i = 0; i < FF_ARRAY_ELEMS(chroma_location_names); i++) {
-        size_t len = strlen(chroma_location_names[i]);
+        size_t len;
+
+        if (!chroma_location_names[i])
+            continue;
+
+        len = strlen(chroma_location_names[i]);
         if (!strncmp(chroma_location_names[i], name, len))
             return i;
     }