diff --git a/pkg/powershell/higherops_test.go b/pkg/powershell/higherops_test.go
index 370f6ec..4f4c1db 100644
--- a/pkg/powershell/higherops_test.go
+++ b/pkg/powershell/higherops_test.go
@@ -309,3 +309,47 @@ func TestCpowershellCommandWithNamedParameters(t *testing.T) {
 	}
 	validate(t, "", record.lines)
 }
+
+func TestCpowershellCommandArgumentTypePanic(t *testing.T) {
+	record.Reset()
+	// create a runspace (where you run your powershell statements in)
+	runspace := CreateRunspace(fmtPrintLogger{}, nil)
+	// auto cleanup your runspace
+	defer runspace.Delete()
+
+	var caughtUnknownArgumentType bool
+	func() {
+		defer func() {
+			if r := recover(); r != nil {
+				if r == "unknown argument type" {
+					caughtUnknownArgumentType = true
+				}
+			}
+		}()
+		paramResults := runspace.ExecScript(`"Software" + "Type"`, true, nil, 1)
+		defer paramResults.Close()
+	}()
+
+	if !caughtUnknownArgumentType {
+		t.Fail()
+	}
+	caughtUnknownArgumentType = false
+
+	func() {
+		defer func() {
+			if r := recover(); r != nil {
+				if r == "unknown argument type" {
+					caughtUnknownArgumentType = true
+				}
+			}
+		}()
+		results := runspace.ExecCommand("Get-ItemPropertyValue", true, map[string]interface{}{
+			"Name": 1,
+		})
+		defer results.Close()
+	}()
+	if !caughtUnknownArgumentType {
+		t.Fail()
+	}
+	validate(t, "", record.lines)
+}
diff --git a/readme.md b/readme.md
index 59a54d3..8304de7 100644
--- a/readme.md
+++ b/readme.md
@@ -1,6 +1,6 @@
 [![Build Status](https://dev.azure.com/oneeyedelf1/powershell.native/_apis/build/status/KnicKnic.go-powershell?branchName=master)](https://dev.azure.com/oneeyedelf1/powershell.native/_build/latest?definitionId=3&branchName=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/KnicKnic/go-powershell)](https://goreportcard.com/report/github.com/KnicKnic/go-powershell)
-[![gopherbadger](https://img.shields.io/badge/Go%20Coverage-97%25-brightgreen.svg?longCache=true&style=flat)](./scripts/code_coverage.ps1)
+[![gopherbadger](https://img.shields.io/badge/Go%20Coverage-99%25-brightgreen.svg?longCache=true&style=flat)](./scripts/code_coverage.ps1)
 [![GoDoc](https://godoc.org/github.com/KnicKnic/go-powershell/pkg/powershell?status.svg)](https://godoc.org/github.com/KnicKnic/go-powershell/pkg/powershell)
 
 # Status