diff --git a/src/0xc/std/struct.h b/src/0xc/std/struct.h
index 53e820a..669273e 100644
--- a/src/0xc/std/struct.h
+++ b/src/0xc/std/struct.h
@@ -370,6 +370,11 @@ struct_field_read_integer(
 	} \
 \
 	iv_0xc = struct_field_read_integer((SF), (P), (L), &ivmem_0xc); \
+	if (!iv_0xc) { \
+		panicx("failed to read unsigned integer field: " \
+				"obj = %s, field = %s", \
+				(SF)->sf_struct, (SF)->sf_fld); \
+	} \
 	switch ((SF)->sf_size) { \
 	case sizeof(uint8_t): \
 		v_0xc = iv_0xc->iv_int8.vu; \
@@ -424,6 +429,11 @@ struct_field_read_integer(
 	} \
 \
 	iv_0xc = struct_field_read_integer((SF), (P), (L), &ivmem_0xc); \
+	if (!iv_0xc) { \
+		panicx("failed to read signed integer field: " \
+				"obj = %s, field = %s", \
+				(SF)->sf_struct, (SF)->sf_fld); \
+	} \
 	switch ((SF)->sf_size) { \
 	case sizeof(int8_t): \
 		v_0xc = iv_0xc->iv_int8.v; \