Check for end prior to checking for whitespace.

1 files changed, 1 insertions, 1 deletions

diff --git a/searchlib/src/vespa/searchlib/fef/indexproperties.cpp b/searchlib/src/vespa/searchlib/fef/indexproperties.cpp
index 659c7d2c8cc..1551b63316c 100644
--- a/searchlib/src/vespa/searchlib/fef/indexproperties.cpp
+++ b/searchlib/src/vespa/searchlib/fef/indexproperties.cpp
@@ -55,7 +55,7 @@ lookupUint32(const Properties &props, const vespalib::string &name, uint32_t def
         const auto & valS = p.get();
         const char * start = valS.c_str();
         const char * end = start + valS.size();
-        while (isspace(start[0]) && start != end) { start++; }
+        while ((start != end) && isspace(start[0])) { start++; }
         std::from_chars(start, end, value);
     }
     return value;