diff --git a/log/config.go b/log/config.go
index 1759f21..253eb1e 100644
--- a/log/config.go
+++ b/log/config.go
@@ -114,9 +114,13 @@ func (c *ConfigStruct) applyEnv() error {
 
 	// Extra Fields
 	if v := os.Getenv(fmt.Sprintf("%s%s", envPrefix, "EXTRA_FIELDS")); v != "" {
+		if c.ExtrasFields == nil {
+			c.ExtrasFields = make(map[string]interface{})
+		}
+
 		extraFieldsPart := strings.Split(v, ",")
 		for _, efp := range extraFieldsPart {
-			extraFieldKV := strings.SplitN(efp, ":", 1)
+			extraFieldKV := strings.SplitN(efp, ":", 2)
 			if len(extraFieldKV) != 2 {
 				return errors.NotValidf(fmt.Sprintf("Invalid extra_field %s in environment variable. Should be a key1:value1,key2:value2 format", efp))
 			}
diff --git a/tracing/config.go b/tracing/config.go
index 19de364..03df409 100644
--- a/tracing/config.go
+++ b/tracing/config.go
@@ -116,9 +116,13 @@ func (c *ConfigStruct) applyEnv() error {
 
 	// Attributes
 	if v := os.Getenv(fmt.Sprintf("%s%s", envPrefix, "ATTRIBUTES")); v != "" {
+		if c.Attributes == nil {
+			c.Attributes = make(map[string]string)
+		}
+
 		attributeParts := strings.Split(v, ",")
 		for _, ap := range attributeParts {
-			attributeKV := strings.SplitN(ap, ":", 1)
+			attributeKV := strings.SplitN(ap, ":", 2)
 			if len(attributeKV) != 2 {
 				return errors.NotValidf(fmt.Sprintf("Invalid attribute %s in environment variable. Should be a key1:value1,key2:value2 format", ap))
 			}