From 0bdfbb3a283f4e7889cebb577db7dd989f855561 Mon Sep 17 00:00:00 2001
From: Christian Rohlfs <anonymous8@protonmail.com>
Date: Sat, 3 Dec 2022 14:03:18 +0000
Subject: [PATCH] Child id may be null; #7944 fix

---
 src/extension/internal/filter/filter.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/extension/internal/filter/filter.cpp b/src/extension/internal/filter/filter.cpp
index 6a63a8112c..5bd7365837 100644
--- a/src/extension/internal/filter/filter.cpp
+++ b/src/extension/internal/filter/filter.cpp
@@ -158,7 +158,8 @@ void Filter::effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::Vie
             gchar * lfilter = g_strndup(filter + 5, strlen(filter) - 6);
             Inkscape::XML::Node * filternode = nullptr;
             for (Inkscape::XML::Node * child = defsrepr->firstChild(); child != nullptr; child = child->next()) {
-                if (!strcmp(lfilter, child->attribute("id"))) {
+                const char * child_id = child->attribute("id");
+                if (child_id != nullptr && !strcmp(lfilter, child_id)) {
                     filternode = child;
                     break;
                 }
-- 
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