diff --git a/_fixtures/nodisasm/main.go b/_fixtures/nodisasm/main.go
new file mode 100644
index 00000000..fe8d6420
--- /dev/null
+++ b/_fixtures/nodisasm/main.go
@@ -0,0 +1,7 @@
+package main
+
+func asmFunc()
+
+func main() {
+	asmFunc()
+}
diff --git a/_fixtures/nodisasm/nodisasm_amd64.s b/_fixtures/nodisasm/nodisasm_amd64.s
new file mode 100644
index 00000000..67a0fdee
--- /dev/null
+++ b/_fixtures/nodisasm/nodisasm_amd64.s
@@ -0,0 +1,16 @@
+#include "textflag.h"
+
+TEXT ·asmFunc(SB),0,$0-0
+	MOVQ AX, AX
+	MOVQ AX, AX
+	MOVQ AX, AX
+	MOVSS (AX), X2
+	VBROADCASTSS X2, X2
+	VMOVDQU (AX), X3
+	MOVSS (AX), X1
+	PUNPCKLBW X0, X1
+	VPUNPCKLWD X0, X1, X1
+	MOVQ AX, AX
+	MOVQ AX, AX
+	MOVQ AX, AX
+	RET
diff --git a/pkg/proc/disasm_amd64.go b/pkg/proc/disasm_amd64.go
index 3bb4616f..2b3bd10c 100644
--- a/pkg/proc/disasm_amd64.go
+++ b/pkg/proc/disasm_amd64.go
@@ -56,6 +56,9 @@ func (inst *AsmInstruction) Text(flavour AssemblyFlavour, bi *BinaryInfo) string
 }
 
 func (inst *AsmInstruction) IsCall() bool {
+	if inst.Inst == nil {
+		return false
+	}
 	return inst.Inst.Op == x86asm.CALL || inst.Inst.Op == x86asm.LCALL
 }
 
diff --git a/pkg/proc/proc_test.go b/pkg/proc/proc_test.go
index 5e2e591c..d66d6f01 100644
--- a/pkg/proc/proc_test.go
+++ b/pkg/proc/proc_test.go
@@ -3996,3 +3996,15 @@ func TestReadDefer(t *testing.T) {
 		}
 	})
 }
+
+func TestNextUnknownInstr(t *testing.T) {
+	if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 10) {
+		t.Skip("versions of Go before 1.10 can't assemble the instruction VPUNPCKLWD")
+	}
+	withTestProcess("nodisasm/", t, func(p proc.Process, fixture protest.Fixture) {
+		_, err := setFunctionBreakpoint(p, "main.asmFunc")
+		assertNoError(err, t, "setFunctionBreakpoint()")
+		assertNoError(proc.Continue(p), t, "Continue()")
+		assertNoError(proc.Next(p), t, "Next()")
+	})
+}