LibWeb: Lazy evaluate optional to avoid crash

1 files changed, 4 insertions, 2 deletions

diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
index 8c75b3b8d5..902babeda0 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
@@ -7492,8 +7492,10 @@ ErrorOr<Parser::PropertyAndValue> Parser::parse_css_value_for_properties(Readonl
                 break;
             case CalculatedStyleValue::ResolvedType::Integer:
             case CalculatedStyleValue::ResolvedType::Number:
-                if (property_accepts_numeric)
-                    return PropertyAndValue { property_accepting_integer.value_or(property_accepting_number.value()), calculated };
+                if (property_accepts_numeric) {
+                    auto property_or_resolved = property_accepting_integer.value_or_lazy_evaluated([property_accepting_number]() { return property_accepting_number.value(); });
+                    return PropertyAndValue { property_or_resolved, calculated };
+                }
                 break;
             case CalculatedStyleValue::ResolvedType::Length:
                 if (auto property = any_property_accepts_type(property_ids, ValueType::Length); property.has_value())