diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index 6b70c0ccc2..93373e03d2 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -2385,10 +2385,12 @@ static CURLcode get_cert_chain(struct connectdata *conn,
         X509_get0_signature(&psig, &palg, x);
         X509_signature_print(mem, palg, a);
         ASN1_STRING_free(a);
-      }
-      i2a_ASN1_OBJECT(mem, palg->algorithm);
-      push_certinfo("Public Key Algorithm", i);
 
+        if(palg) {
+          i2a_ASN1_OBJECT(mem, palg->algorithm);
+          push_certinfo("Public Key Algorithm", i);
+        }
+      }
       X509V3_ext(data, i, X509_get0_extensions(x));
     }
 #else