diff --git a/src/osx/btop_collect.cpp b/src/osx/btop_collect.cpp
index a2c4f62..5528214 100644
--- a/src/osx/btop_collect.cpp
+++ b/src/osx/btop_collect.cpp
@@ -1249,7 +1249,12 @@ namespace Proc {
 						new_proc.ppid = kproc.kp_eproc.e_ppid;
 						new_proc.cpu_s = kproc.kp_proc.p_starttime.tv_sec * 1'000'000 + kproc.kp_proc.p_starttime.tv_usec;
 						struct passwd *pwd = getpwuid(kproc.kp_eproc.e_ucred.cr_uid);
-						new_proc.user = pwd->pw_name;
+                        if (pwd != nullptr) {
+                            new_proc.user = pwd->pw_name;
+                        } else {
+                            new_proc.user = "unknown";
+                            Logger::warning("Could not retrieve user information for user ID:" + std::to_string(kproc.kp_eproc.e_ucred.cr_uid) + " (pid:" + std::to_string(pid) + ")");
+                        }
 					}
 					new_proc.p_nice = kproc.kp_proc.p_nice;
 					new_proc.state = kproc.kp_proc.p_stat;