JabRef entry warning

[Rich Shepard]

Biber tells me "WARN - Name in key 'Paul2012' is empty (probably consecutive
'and'): skipping entry 'Paul2012'" and the entry in the jabrefdb.bib is:
@techreport{Paul2017,
 	abstract = {This paper summarizes the application of algae as indicators of nutrient
 	pollution in water quality management. It describes the use of algal
 	indicators to develop water quality diagnostics for nutrient pollution
 	in the United States (U.S.) and then reviews scientific developments
 	in the use and application of algal indicators across the world.
 	The paper is intended as a technical resource for the water quality
 	manager/practitioner seeking to utilize algae to detect the presence
 	of nutrient pollution and to estimate the risks of nutrient pollution
 	in adversely affecting the condition of stream ecosystems.},
 	author = {Paul, M.J.},
 	institution = {Tetra Tech, Inc./ Center for Ecological Sciences},
 	keywords = {streams, rivers, lakes, ponds, algae, pollution, water quality, indicators},
 	pagetotal = {44},
 	title = {{Algal Indicators in Streams: A Review of Their Application in Water Quality Management of Nutrient Pollution}},
 	type = {techreport},
 	year = {2017}
}

I'm not seeing the empty error in the name. Why does biber find it empty?

Rich