diff --git a/src/processor/stackwalker_x86.cc b/src/processor/stackwalker_x86.cc
index 4a7e811d..aeb18a9f 100644
--- a/src/processor/stackwalker_x86.cc
+++ b/src/processor/stackwalker_x86.cc
@@ -447,7 +447,7 @@ bool StackwalkerX86::ScanForReturnAddress(u_int32_t location_start,
     if (!memory_->GetMemoryAtAddress(location, &eip))
       break;
 
-    if (modules_->GetModuleForAddress(eip) &&
+    if (modules_ && modules_->GetModuleForAddress(eip) &&
         InstructionAddressSeemsValid(eip)) {
 
       eip_found = eip;