diff --git a/ChangeLog.adoc b/ChangeLog.adoc
index 254ab3822..fb547bdfd 100644
--- a/ChangeLog.adoc
+++ b/ChangeLog.adoc
@@ -36,6 +36,7 @@ Improvements::
 Bug fixes::
 
   * core, irc, xfer: refresh domain name and name server addresses before connection to servers (issue #771)
+  * api: fix crash in function network_connect_to() if address is NULL
   * api: fix connection to servers with hook_connect() on Windows 10 with Windows subsystem for Linux (issue #770)
   * api: fix crash in function string_split_command() when the separator is not a semicolon (issue #731)
   * irc: fix NULL pointer dereference in 734 command callback (issue #738)
diff --git a/src/core/wee-network.c b/src/core/wee-network.c
index b61d18faf..44dcea4d6 100644
--- a/src/core/wee-network.c
+++ b/src/core/wee-network.c
@@ -674,6 +674,9 @@ network_connect_to (const char *proxy, struct sockaddr *address,
     sock = -1;
     proxy_addrinfo = NULL;
 
+    if (!address || (address_length == 0))
+        return -1;
+
     ptr_proxy = NULL;
     if (proxy && proxy[0])
     {