Fix for issue #9775. Added check for open() returning a NULL pointer.

1 files changed, 8 insertions, 7 deletions

diff --git a/src/util.cpp b/src/util.cpp
index ba157625d8..78c353dfe5 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -214,12 +214,13 @@ void OpenDebugLog()
     assert(vMsgsBeforeOpenLog);
     boost::filesystem::path pathDebug = GetDataDir() / "debug.log";
     fileout = fopen(pathDebug.string().c_str(), "a");
-    if (fileout) setbuf(fileout, NULL); // unbuffered
-
-    // dump buffered messages from before we opened the log
-    while (!vMsgsBeforeOpenLog->empty()) {
-        FileWriteStr(vMsgsBeforeOpenLog->front(), fileout);
-        vMsgsBeforeOpenLog->pop_front();
+    if (fileout) {
+        setbuf(fileout, NULL); // unbuffered
+        // dump buffered messages from before we opened the log
+        while (!vMsgsBeforeOpenLog->empty()) {
+            FileWriteStr(vMsgsBeforeOpenLog->front(), fileout);
+            vMsgsBeforeOpenLog->pop_front();
+        }
     }
 
     delete vMsgsBeforeOpenLog;
@@ -838,4 +839,4 @@ std::string CopyrightHolders(const std::string& strPrefix)
         strCopyrightHolders += "\n" + strPrefix + "The Bitcoin Core developers";
     }
     return strCopyrightHolders;
-}
+}
\ No newline at end of file