Fix: avoids crash if UNIQUE_ID is not set

Issue #46

Author: Felipe Zimmerle

CHANGES

@@ -1,6 +1,8 @@
 v3.0.x - YYYY-MMM-DD (To be released)
 -------------------------------------
 
+ - Fix: avoids crash if UNIQUE_ID is not set
+   [Issue #46 - @Goron1606, @victorhora, @zimmerle]
  - Proposed fix for msc_process_request_body call too early
    [Issue #22 - @victorhora]
  - Adds make install to the build system

src/mod_security3.c

@@ -146,7 +146,7 @@ static msc_t *create_tx_context(request_rec *r) {
 
     msr->r = r;
     unique_id = getenv("UNIQUE_ID");
-    if (unique_id != NULL || strlen(unique_id) > 0) {
+    if (unique_id != NULL && strlen(unique_id) > 0) {
         msr->t = msc_new_transaction_with_id(msc_apache->modsec,
             (Rules *)z->rules_set, unique_id, (void *)r);
     } else {