diff --git a/src/logging.cpp b/src/logging.cpp
index a9b2a2b33a5..2d278bcef80 100644
--- a/src/logging.cpp
+++ b/src/logging.cpp
@@ -352,7 +352,7 @@ std::string BCLog::Logger::LogTimestampStr(const std::string& str)
         const auto now{SystemClock::now()};
         const auto now_seconds{std::chrono::time_point_cast<std::chrono::seconds>(now)};
         strStamped = FormatISO8601DateTime(TicksSinceEpoch<std::chrono::seconds>(now_seconds));
-        if (m_log_time_micros) {
+        if (m_log_time_micros && !strStamped.empty()) {
             strStamped.pop_back();
             strStamped += strprintf(".%06dZ", Ticks<std::chrono::microseconds>(now - now_seconds));
         }